Synthetic transmission oils GL 4. Transmission oil: from dental pain

Transmission boxes and leading bridges are called transmission. Transmission and engine oils have a similar classification. For TM, the main properties are: viscous characteristics, operational and anti-corrosion properties, as well as lubricating and thermo-oxidative.

Transmission Oil Overview 75W-90

Transmission oil, as well as the motor, has its own, which also need to be able to properly decipher. On a label with butter present sAE classification and API.there are some classifier ZF. or mil Specificationand maybe tolerances of individual automakers.

All modern transmission oils must comply with the classification according to the international standard SAE J306. 75W90 The most commonly used degree of viscosity among transmission fluids.

The value of the viscosity characteristics 75W and 90

According to SAE, TM is divided into types and, accordingly, on their purpose, depending on viscosity. Since it will be about 75W-90 transmission oil, we will understand first of all with its characteristics.

75W - This indicator is known as "Winter" shows the degree of fluidity at negative temperatures. The lower the value in front of the letter "w", the themes of the transmission is more fluid in the cold. For this type of oil, the threshold should be at -40 ° C.

The second viscosity range indicator - 90 It is also called "summer", indicates the maximum transferred plus temperature of the outer air at a temperature of 100 degrees Celsius. By itself, the parameter also does not reflect the true meaning, you just need to know that according to reference data, this threshold will be up to +35 ° C.

It would seem why 75W90 oil is the most acceptable for our latitudes.Why not create a universal with an even wider temperature spectrum? But not everything is so simple. Protection against friction between the gear surfaces directly depends on the lubricating ability of transmission oil. Although this indicator with an increase in viscosity is significantly improved, the law of resistance shall enter into force, the loss of transmission power increases, through the waste of energy to extrude it from under the gear teeth. And also viscous oil is very thick in the cold. The less viscous, at minus temperatures, feels good, but it has a less durable protective film and the worst lubricant property. To balance these two indicators, special additive packages are also used.

In the zone of moderate temperatures, it is better to focus on the class of viscosity "90", but "140", that is, TM, the viscosity of which at 100 ° C is not lower than 24 mm2 / s, it may be preferable for a hot southern climate or high speeds with high speeds .

The transmission fluid must perform such functions:

• exclude friction, jamming, jackets, pitting (deep corrosion of metal) and other damage;
• reduce energy loss and increase efficiency;
• remove heat from friction surfaces;
• reduce noise and vibration when working gears.

Therefore, TM 75W90 from different manufacturers, of course, is somewhat different with its properties, and, of course, with its price tag. In addition, transmission oil 75W90 is often synthetic, although in some cases, a number of manufacturers may indicate on its label as semi-synthetic. But in fact, it differs from synthetics only by the content of a synthetic substance of 20% - 40% and the number of additives from 2 to 15%.

In addition to the fact that these fluids are classified according to the SAE system, there is a separation of transmission oils and through the API system with the "GL" index (in the Russian version - the TM index).

Operational properties of TM.

API classification shows a comprehensive assessment. Transmission depending on the operational properties and is divided into six categories. Categories are marked by the index, which makes it possible to understand the scope of application and the quality level of the product. In the transmissions of passenger cars, today, liquids are used only two groups - GL-4 and GL-5 (TM-4, TM-5 for domestic classification).

GL-4. (or TM-4) - designed for medium loaded gears. Used in manual transmission and mechanisms with spiral conical gears. Operation of such oils can be carried out in transmission transmissions hypoid type at considerable speeds, but small or moderate torque.

GL-5. (or TM-5) - applied to highly loaded gears. Operation of oil with such a standard is carried out in hypoid gears at small torque, in combination with high speeds, which are subjected to short-term shock load. Such oil contains a large number of gray-phosphorus-containing anti-grade additives.

Also very common oil 75W90 with marking - GL-4/5, the presence of two indices indicates the application in different conditions of the load and of different types mechanisms.

Mil Specification

In addition to classification by API, often used american Mil Specification. For 75W90, this is MIL-L 2105 A, B or C. Confirms compliance with technical Conditions All-season transmission oils, Analog API GL-4 or GL-5.

The quality classifier of transmission oils by ZF

Also on the canister with oil 75W-90 can be seen classifier Z., - this is classification system for all types of motor transport. The designation is made by letters and numbers from ZF TE-ML 01 to ZF TE-ML 14.

What is the difference between GL-4 oils from GL-5 75W-90?

As already stipulated a little higher, the appointment of TM oils GL-4. (according to GOST 17479.2-85) - to work in transmissions with conical and hypoid transmissionsoperating at contact voltages up to 3000 MPa and oil temperature up to 150 ° C. By and large, it is gearboxes front-wheel drive. API. GL-5. - provides reliable job hypoid transmissionrunning with shock loads at stresses above 3000 MPa. It is used in gearboxes with hypoid conical gears and for the main transmission with a cardan drive in leading bridges (with an increase in increased friction of LSD). Such a transmission fluid provides better protection under high loads and pressures.

Errors when choosing TM 75W90 and the difference between GL 4 and GL 5.

Key feature is that in oils 75W90 API GL-4, two times less gray-phosphoric additives rather than in similar, only class above. Such additives create a special protective covering On the details warning from wear, however, this substance is even stronger than the surface of parts from copper or other soft alloys. Therefore, the use of TM is not for the purpose threatened with the wear of the surface of the element made of soft metal. So, in those gearbox, where 75W90 GL-4 should be applied, and the GL-5 is poured, there is a rapid appearance of copper chips, because synchronizers are made of copper, and the gray-phosphoric additive kills them.

Transition from GL-4 to GL-5 and inversely invalid: it miscellaneous oils with different properties and destination.

Rating of the best transmission oils with viscosity 75W90

• Viscosity. Oil must maintain an optimal viscosity as at low temperature, so maintain its binding properties at high temperatures;
• Temperature characteristics. Each liquid has its own temperature and ignition temperatures, TM should have the largest gap between these indicators;
. The higher this figure, the better the product;
• Zadira index. Unfortunately, there are no norms on this index, but the higher the value, the better TM;
. According to GOST, such a value should be no less than 3,000 H;
• Exchange of wear. Such a criterion is determined only for oil class GL-5, it must be less than 0.4 mm.

The top of the best transmission oils does not take into account their cost, and is based on feedback and comparative tests.

For many transmission oil parameters Motul Gear 300. 75W90 ranks first among all subjects. This transmission has the highest levels of protection against scaling (index is 60.1), welding, stability of the oil film without the loss of engine power, average wear indicator (0.75 mm). Although viscous characteristics (especially at minus temperatures) boast and cannot.

Temperature test transmission oils 75W90

The second and third places occupy transmission fluids from Castrol (Syntrans) and Mobil (Mobilube). Butter Castrol Syntrans TRANSAXLE. 75W-90 GL-4 is used in gearboxes, in dispensing boxes and leading bridges. It has a good low-temperature fluidity, but compared with a mobile, the index of the loop is quite large, as for fluid of this class, but the level of wear is even better than that of Motuly (59.4).

TM Mobil Mobilube. You can put in third place because it has good test results on the level of protection and wear at high loads, therefore provides low friction losses at operating temperatures. But, unfortunately, has an insufficient viscosity index at minus temperature.

The fourth result when testing the transmission oil showed oil Total Transmission SYN FE 75W-90. Reviews about this liquid also quite good, although it is universal - has an API GL-4 / GL-5, it will not be suitable for all transmissions. This TM has a level of loop equal to 58.8, which is even better than the leader of the rating of transmission oils 75W90. But it cannot boast the level of wear and good viscosity at low temperature test.

Semi-synthetic transmission oil Liqui Moly Hypoid-Getriebeoil TDL 75W-90 GL-4/5, but also shows well in tests, especially released when tested in minus 40, its fluidity at such a low temperature without problems will allow the box and gearboxes. However, others important indicators on the Middle level.

Synthetic oil Zic G-F Top 75W-90 In this rating, we do not turn on, because there are very few data on its wear and bully indicators, although the temperature test passes on excellent. This transmission oil can be used in the MCPP (including synchronized transmissions) and leading bridges. According to the reviews of car owners, significantly reduces the noise of transmission, withstands extreme loads and practically does not have drawbacks.

Also, it is also impossible not to pay attention to TRANSYN 75W-90 API GL 3/4/5 from the EUROL manufacturer, because looking at the lack of real temperature tests and a very high wear level - 0.94, has a good level of loot - 58.5 and more popularity Among motorists.

As you can see, the range of transmission oils 75W90 on the market is great enough and there is always something to choose for your needs and affordable price. But remember that it is not necessary to select because the neighbor advised, but on the basis of the needs of the transmission of your car and the characteristics of the most transmission fluid.

Lubricating fluids in the vehicle are not only in force aggregates. Threaded parts are present in many components of cars, so the use of different kinds of oils is inevitable. Quite often come across a motor and transmission lubricants. As for the last option, it often arises questions in terms of characteristics and viscosity, due to which the choice is hampered.

Popular lubricant

One of the most popular lubrications for the transmission is all-season oil 75W90. It is used by most motorists, since it has a high level of protection of parts, an enlarged temperature range, as well as unique fluidity properties. Replacing lubricants for the manual transmission and the leading bridge occurs much less and less frequently than in the case of a motor, the more important to choose a good durable option.

What is "75W90"?

Acquaintance with transmission oils should always be started with viscosity. Decoding SAE 75W90 is quite simple. In the title three parts, each of which makes it possible to learn about certain properties of the fluid. It begins with the SAE abbreviation, which translated from English means: "Community of automotive engineers." This organization first introduced the classification of motor and viscosity class, which is used to this day.

Goes after SAE code 75w. It shows that when using this fluid in winter, problems with operation should not be with the exception of very strong frosts. It is impossible to specify exactly the minimum temperature threshold, since manufacturers often deviate from the community indicators.

As a result, the average value of this parameter, in which the presenter bridge, and the gearbox is working properly, and the mixture does not freeze, is about -40 degrees.

The last part is the number 90 at the end of the code. It makes it possible to understand when it is possible to use transmission oils 75W90 without loss of viscosity, density and fluidity. There is a serious scatter in this indicator in lubricants of various manufacturers, so we do not have to talk about exact numbers.

Nevertheless, on average, they are all designed to work at a temperature not higher than 35 degrees.

In this way, oil SAE. 75W90 are designed to lubricate leading bridges and gearboxes under weather conditions that range from -40 to 35 degrees. You can use them in zones with almost any climate (with the exception of territories with extremely high or low temperature indicators).

Features of oil

The characteristics of the lubricant fluid dependely depend on the class of viscosity, but also from its composition. Regarding the latter it is worth noting that the most popular and qualitative option is. It is capable of providing the highest possible protection against the wear of the MCPP parts and the leading bridge, creating an oil film on their surfaces, filling irregularities and enveloping intact sections.

Another task of this lubricant is to improve the quality of the gearbox. This applies primarily to the smoothness.

Due to its viscosity, it is easily and evenly distributed in detail, compensating for friction and replacing it to slide. Due to this manual transmission, it works silently and efficiently.

In addition, it allows you to increase heat exchange between oil and processed components: the latter during overheating give part of its energy of a colder fluid.

As for the semi-synthetic mixtures, they are not recommended to use them often. The fact is that mineral components can contribute to the gearbox. Moreover, liquids this type Have less resistance to frosts, while synthetics reacts perfectly with the cold itself, and sharp differences.

Tests of oils

On the market supplies You can find a large number of most different oils.

Of course, you don't want to take random and try this or that option, because in case of error you have to stay on for a long time without vehicleIn addition, having received serious cash costs.

therefore the best decision - see the results of independent tests automotive experts. There are quite a lot of such studies, but in general they give approximately the same results: only validation samples are changing.

The main task, as a rule, is the study of viscosity at extremely low temperatures, because -40 degrees is only an approximate average value. In the meantime, not only the operation of the transmission depends on this indicator, but also fuel consumption. There are oils from different price categories. As a rule, the cost ranges from 400 to 1300 rubles per liter.

The test samples are placed in conditions of reduced temperature. The most accurate test of transmission oils 75W90 will be carried out in natural frost (Siberian and Northern regions), it will allow to obtain accurate information about fluid behavior in practice. As a rule, the thermometer column is lowered up to 45-50 degrees below zero, as it allows you to learn the minimum threshold of lubrication.

It was tested quite a large number of oil models from various manufacturers. If you analyze a number of studies, it can be argued that some of the best are liquids from Castrol and Motul. They consistently withstand the differences before the fifty degrees of frost. Keep the viscosity with the standard threshold to -40 degrees lubrication of the Shell, Ravenol and Liqui Moly.. The popular oil transmission Zic 75W90 begins to stack a little earlier, so in the climate conditions sharply continental it is better not to use it. The same applies to the liquids of ENEOS and MITASU manufacturers.

Conclusion

Thus, transmission oils are one of the most important liquids in the car engine. They allow you to reliably protect the details of the leading bridges and gearboxes, making the speed switches smooth and easy. Before purchasing lubricant, you need to study various reviews and tests in order not to harm your vehicle.

SAE 75W 90 Synthetic oil for manual transmission is popular in popularity. Despite the fact that today, more often, car manufacturers deny the need to replace oil in the gearbox, many car owners pay this attention to this.

Characteristics of these liquids

In general, starting a conversation about which oil for transmissions can be considered the best, it is necessary to understand that the universal solution simply cannot be. By and large, it all depends on the brand of the car, and what is perfectly suitable for one model, it will work badly for another, or even harm at all. Not to mention the fact that the types of gearbox differ in each other. Wide range of proposals from manufacturers lubricants Allows you to create some rating of the most sought-after transmission oils for a variety of cars.

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How to choose the desired lubricant?

It should be noted that lubricating liquidswhose viscosity is less than 24 mm2 / s, at a temperature of 100 ° C, belong to the class 140 according to SAE, and this means that they can only be used for a terrain with a warm climate. If the car is supposed to be operated in cold winters (from -10ºС to -45), then it is better to choose a class under the markings 90.

It was necessary to note that for some reason the semi-synthetic transmission oil of domestic production was not met among all the diversity, which would satisfy the demands of car owners. For the most part, German fluids are used in demand, sometimes they are complemented by other European brands (French or Dutch).

Despite the fact that the load on the transmission fluid is still less than on the engine oil, but in which case this product requires not only to provide high-quality lubricant, but also to protect the mechanism from premature wear and appearance of scaling. Therefore, the test included all the important characteristics, including viscosity and those present as part of the additive.
It must be said that viscosity can be evaluated in different ways. For example, in conditions of normal operating temperatures, it makes sense to evaluate kinetic viscosity indicators, and in the case of low temperature modes - also dynamic.

The scale of viscosity changes at a temperature of 100 ° C varies from 13.5 to 24 CST, while using the oil 75W90, as the most suitable for climatic conditions in our latitudes. Moreover, it is necessary to understand that a smaller value of viscosity, subject to negative values \u200b\u200bof the thermometer, means faster and high-quality heating of the box, and therefore more convenient control of the car in frosty days.

So let's consider some of the transmission oils presented in the market. The most popular was the synthetic oil Castrol Syntrans Universal Plus SAE 75W 90. It corresponds to the class API GL-4 / GL-5. And specifically designed for use in the manual transmission and contains a whole set of effective additives that impede the oxidation of the product, and also wear the internal nodes of the gearbox. Judging by the reviews of users, it perfectly showed itself in a wide range of temperature regimes, and there are practically no complaints in terms of wear protection.

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Relationship with other brands

The next rating should Honda CVT, which is most suitable for this brand of cars. They say this product showed neutrality with respect to sealing materials and is quite effective with a sharp decrease in temperature in winter.

Relative novice (since not so long ago was on sale in our stores), this product is still designed for a manual transmission. The basis of his synthetic, which means a long service life. And the presence of a package of additives with anti-corrosion, anti-naming and anti-wear properties makes it a completely successful choice for any car.

It should be said that as one of the most suitable for the northern regions of our climatic zone was noted zIC oil G-F Top 75W 90. Moreover, those owners of cars that used this brand of transmission fluid noted that previously concerned their noise in the transmission decreased significantly after this product was covered in the system. Separately pleased that the price of this product is quite democratic.

Another representatives of the SASTROL SYNTRANS TRANSAXLE SAE 75W 90 brand has a completely synthetic basis. This oil is not only suitable for use in the manual transmission, but still intended for any other nodes, where the use of lubricant corresponding to the GL-4 API class is necessary. Chief flaw This lubricant is a high price, but for many, the quality will still outweigh.

Separately, it is worth mentioning the universal transmission fluid Total TRANS SYN FE 75W90 appropriate aPI classes GL-4, API GL-5 and MT-1. The viscosity index indicators indicate that even at very low temperatures, the liquid does not thicken. In addition, it is much less likely to be replaced than some other oils of the same group.
For owners of car brand Renault recommended semi-synthetic oil For manual transmission ELF TransF NFJ 75W80. It can be said that a high price is the most significant disadvantage of this product.

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For owners of the front-wheel drive cars of the recent release of domestic production showed well total oil 75 W 80 BV. According to the manufacturer, it is perfectly opposed to oxidation, keeping its properties for the entire service life. It is distinguished by a democratic price that it is important for many.
It is believed that from noise in the checkpoint you can get rid of if replacing the recommended transmission fluid (oil 75W90, 85W 90) on a larger viscosity liquid (80W 140, 85W 140). It is explained by this opinion by the fact that a denser layer of oil is able to partially smooth out the irregularities in the worked teeth, but it is necessary to take into account that it is compensated for by such a state of affairs will be a significant increase in fuel consumption, especially noticeable in winter. There will be inconvenience in the difficult shift shift, and therefore it will have to make more efforts during the trip.

You can reach the effect of reduction of noise by adding additives with molybdenum or other components that reduce friction. But I must say that it does not always help and only if there is a weak degree of wear.

Undoubtedly, it must be remembered that we should not mix transmission oils belonging to different classes. Just like oils on a synthetic basis with semi-synthetic or mineral oils. It is likely that additive packages added to them different manufacturerswill be incompatible, and as a result will have to pay for repair.

If there is a need to replace mineral oil On synthetic or semi-synthetic, then it is better to preheat the system.

Flashing is done using the transmission fluid, which is planned to be used subsequently.

If this option seems too expensive, you can rinse with transformer oil or spit. Oil replacement should be carried out every 50,000 - 70,000 km. However, this is for the conditions that correspond to the European quality of the road cover, and in the case of our roads, these figures have to be reviewed. So, if for Germany, the transmission can be replaced in the gearbox after eighty thousand mileage kilometers, then for our climate and state of roads, this figure is about twenty-five thousand.

If, of course, there is a desire as long as possible to postpone the repair of the gearbox. In some cases, the lubricant must be changed even earlier. This is especially true if the transmission oil dramatically darkened or acquired a foreign smell - it is better to immediately contact the service to check the reason for such a change. It may be possible to get rid of light repair of the checkpoint, then rinse the system and pour fresh oil. The main thing is to be aware of events and do not forget to take care of your car, then the period of service of your TS will increase significantly.

Technical fluids used in mechanical boxes Transmissions, handouts, leading bridges are called transmission oils. The classification of transmission oils has a similar structure with the motor. But in contrast to them, the key parameters are: the heat-oxidative ability, lubricating the function, the anti-corrosion effect, as well as viscous characteristics. In addition, transmission oil, by analogy with the motor, has labeling. The packaging contains the SAE and API classification, as well as possible tolerances from individual automakers.

Production Technology Atomium Support

The first digit and the letter designation W (Winter, Winter) indicates us to the degree of fluidity at negative temperatures. The smaller the value, the more fluid there is fluid in the cold. The indicator 75 is equal to -40 ° C.

The second digit is a viscosity range. It is also called summer characteristic. The indicator 90 relates to the plus temperature of 35 ° C. It should be noted that the level of heating mechanisms can reach 100 ° C.

Temperature range 75 ° optimal option For the climatic conditions of Russia, well, why the product was not created with even wider borders of the action, for example, from -60 to +45.50 ° C.

The answer lies in the characteristic of the lubricity of the transmission oil. To maintain viscosity balance at various temperatures, special additive packages are used. In other words, too liquid oil At negative temperatures, it feels great, but it protects worse and lubricates the gears, on the other hand, too viscous oil is the loss of transmission power, energy spending to extrude the transmission fluid from under teeth. Balance in this dilemma managed only in this temperature range. There are other variations of transmission fluids. For example, a transmission oil with parameters 85W140 can be used for hot southern climates and high loads with high speeds.

Oil for manual box GL 4 - Features

Transmission aPI oil GL 4. - Created for media services. The main scope of use is mechanical gearboxes, mechanisms with spiral conical gears. In addition, the operation of this type of oil can be carried out in transmission transmissions of the hypoid type. At the same time, a significant speed indicator should be compensated by a small or moderate torque.

The key point for the categories of oils API GL-4 is that gray-phosphoric additives in them are twice as smaller than the GL-5 technical fluids. The presence of these additive categories allows you to create a unique protective coating. The working contact between the moving elements of the transmission is carried out directly through this protective film. Details are saved from wear. The operational resource increases.

It is worth noting that greater content of gray-phosphorous additives can adversely affect the details of transmission consisting of copper alloys and other soft materials. Their wear in this case increases 1.5-2 times. Buy transmission oil GL-4 For your car, it is possible only if the machine manufacturer pointed out free use in the passport of operation.

GL 5 transmission liquid - application sphere

Transmission oil API GL 5 - Used in highly loaded transmissions. Mostly technical fluids These standards are used in hypoid transmissions, on small torque revolutions, but in combination with high speed. In addition, the transmission elements may be subjected to short-term shock loads. The GL 5 standard is a great content of the gray-phosphorus-containing contamination additive.

Thus, the transmission oil of the fifth series provides the best anti-promotional properties, as well as protection in high loads and pressure. But to the same extent, it is impossible to say 100% that the GL-5 standard completely overlaps the GL-4 modification indicators.

Here, first of all, it is necessary to take into account the material of manufacturing transmission parts, technological features of the work, the degree of current wear, intensity of the current operation.

Comparison of oils GL 4 and GL 5 - Is it possible to replace one other?

Purpose of GL-4 oils is stable work conical transmission and hypoid transmissions. The maximum contact voltage is 3000 MPa, while the temperature is up to 150 ° C. In general, it can be said that this is the gearboxes of front-wheel drive passenger cars. Buying transmission oil GL 5You will ensure the effective operation of the hypoid transmission together with shock loads. In this case, the voltage may exceed the mark of 3000 MPa.

It is worth noting that the transition from GL-4 to GL-5 and back will not allow - these are different oils with different properties and destination. As already indicated above, the key feature is the content of gray-phosphorus additives. The GL-4 standard is two times less. Therefore, if GL-5 is poured instead of GL-4 in the checkp, then there is a rapid appearance of copper chips, since synchronizers are mainly made from copper and its alloys, and gray-phosphoric additives and instantly kill.

Table Comparison Characteristics of GL-4 and GL-5 Transmission Oil

In the market, drivers can find many different product models. The oil 75W90 is very popular. In this regard, the owners of the car are very often interested in what it represents, which characteristics and from which brand is better to buy? We will provide you with answers to these and many other questions.

What role plays oil in the checkpoint

Before talking about the characteristics of any oil, it is necessary to find out which the main tasks should perform this liquid. Its use is due to actually several reasons:

• It serves as a lubricant for moving parts of the checkpoint, while significantly reduces wear. Each transmission oil 75W90 creates a protective film on the surface, which prevents the appearance of microcracks, chosel and other defects on the surface of the gears, as well as other parts of the box.
• Warm heat. During the work of all parts, strong heat dissipation occurs. High temperatures can lead to incorrect operation of the CAT, respectively, and its emergency breakdown. Oil does not allow it.
• Effective corrosion protection. Almost all metals are vulnerable to the destructive effects of oxidizing agents. In order for the gearbox parts not rustled over time, the use of high-quality oil without water content.
• The work of this unit is associated with a large level of noise, which creates discomfort while driving a car. Transmission oil allows you to significantly lower vibration and noise from the work of the PPC.

Thus, the composition of the oil must be fluent enough to ensure full lubricant, and also do not freeze in cold weather.

SAE viscosity parameter

One of the main characteristics on which it is certainly worth paying attention when buying an oil is its viscosity. For the convenience of buying a community of automotive engineers (Society of Automotive Engineers), a standard was developed, which shares all products into several groups, depending on the viscosity parameters.

Sold oils can be divided into summer, winter and all-season. The first are marked by the usual number (from 80 to 250), and the second in the marking have the English letter W (from the word Winter - "Winter"). You can purchase products 70W, 75W, 80W and 85W on the market. However, finding oils for a certain period is becoming increasingly harder, as all-season products were supplied.

In their designation, they have two numbers, divided by the letter W. Let's find out what 75W90 means. The first number of 75W is the so-called winter yield rate. The parameter denotes extreme low temperatureIn which the oil will perform the tasks. For this oil minimum working temperature Is -40 degrees Celsius.

The second number (90) is a summer viscosity. In practice, it shows the maximum temperature ambient With 100 degrees Celsius for the oil itself. According to reference data, this parameter is limited to 35 degrees Celsius above zero. Now you know temperature mode 75W90. Based on these parameters, it can be concluded that the oil is ideal for use in moderate latitudes.

Characteristics of operational properties

Decoding of transmission oil 75W90 viscosity can be an unused designation. Many products are also classified in accordance with API, which shows a comprehensive assessment of the transmission fluid, depending on performance characteristics. You can allocate six groups. IN modern cars The products of only two of them are used:

• GL-4 (or in the TM-4 domestic classification). Similar products are intended for medium-warning gear. As a rule, the oil of this class is used in mechanical gearboxes, as well as in the mechanisms used by spiral conical transmissions. Also, oils can be used in hypoid type transmissions, but only with a small torque.
• GL-5 (TM-5). Used in highly loaded transmissions, in particular, in hypoid transmissions with a small torque, but exposed by short-term shock load. Products are characterized by a high level of serophosphorus-containing contamination additive.

Many car owners will be able to find transmission oil 75W90 GL 4/5. Such transmission can be used in different load conditions, while mostly are a universal version between GL-4 and GL-5.

What is the difference between oils with marking GL-4 and GL-5

As it was previously said, the first and most important difference is the scope of application. GL-4 is designed to work in the PPC with conical and hypoid transmissions. Contact voltages in such aggregates do not exceed 3000 MPa, and the oil temperature is within 150 degrees Celsius.

GL-5 is used for correct operation of the hypoid transmission in combination with shock loads. Such devices operate at voltages above 3000 MPa. Oil is used in aggregates with increased friction differential, providing high-quality protection of parts in conditions high temperatures and loads.

Important distinctive feature GL-4 is the low concentration of gray-phosphoric additives in the composition. They create a very durable protective layer, which is much harder of some of these soft alloys as copper. The use of GL-5 oil in boxes where it is necessary to use the oil to the class below, is invalid. This will lead to the emergence of a large amount of metal chips and wear parts.

What to pay attention to the choice of oil

When buying it is worth navigating not only on the brand, the price of products, but also familiarize yourself with several other important characteristics Product. This can be attributed:

• Viscosity. Transmission oil must maintain its viscosity in a specific temperature range, fulfilling the main functions. Here, when buying, focus on the aforementioned SAE classification.
• The difference between the temperature of frozen and ignition should be maximum. Be sure to take into account this.
• Critical load. The greater the number, the higher the quality of the presented product.
• Zadira index (the higher the indicator, the better).
• Stewing load. According to the GOST Regulations, the parameter must be below 3 thousand Newtons;
• Wear indicator. Relevant only for products of class GL-5. High-quality oil should have no more than 0.4 millimeters.

These are the main characteristics of the 75W90 oil, which is worth paying extreme attention.

Synthetic or semi-synthetic

Typically, drivers on store shelves will find synthetic transmission oils 75W90. At the same time you can meet the semi-synthetic. The first have the best indicators among all types of lubrication. The benefits of such products include:

• The optimal range of operating temperatures.
• Saving fluidity when exposed to minus temperatures.
• Hydrolytic stability.
• Low evaporation and resistance to oxidation.
• Long service life.
• High viscosity index.

Tangible for many car owners, the disadvantage is high price synthetics, therefore alternative option is a semi-synthetic oil, which in terms of indicators is slightly inferior to the product described above, but has more affordable price tag. In other words, the difference in the content of synthetic is about 20-40 percent, and the number of additives may differ by 15 percent.

Transmission Oil Rating 75W90

It is worth noting that the best transmission oil 75W90 is the one that the manufacturer recommends. IN technical manual To your car you can find necessary information. Such products are designed specifically for your foreign car, so comply with all the requirements. But if the cash is clarified, you can purchase another transmission oil 75W90 GL-5 or GL-4 from third-party manufacturer. This will help you the following top.

One of the leading positions on numerous tests is the product Motul Gear 300. The transmission oil is characterized by a high deficiency index (60,1) and an excellent welding indicator. The oil film is highly stable, so optimally minimizes the friction of parts. The wear indicator is 0.75 millimeters. A small disadvantage is bad viscous indicators at minus temperatures.

Castrol Syntrans TransAxle is very popular, which can be placed on the second place. Low temperature fluidity high level Zadira and relatively low price Make this transmission oil in demand from many drivers. The liquid can also boast a high level of wear (59.4).

If the "Castrol" products are not suitable for any reason, order the product from an equally popular brand. Mobil Mobilube takes the third position. The oil of this brand provides outstanding viscosity indicators, optimal protection against thermal destruction and oxidation, and can also be operated at increased intervals. maintenance. The oil is labeled API GL4 / 5.

Another one universal Oil According to the API is Total Transmission Syn Fe. The level of the loop is not far from the above-described products. It is 58.8, which is an excellent indicator. Unfortunately, drivers note low fluidity at minus temperatures and weak wear protection.

Not bad characteristics has Liqui Moly Hypoid-Getriebeoil. It is worth noting the flow rate separately. The oil retained its operational qualities even at a temperature -40. The transmission extends the service life of the nodes and perfectly protects the components of the PPC from rust.

If the priority is to lower the noise of the gearbox and provide maximum protection against scoring, we recommend purchasing ZiC G-F TOP. Oil without problems withstands extreme loads, while perfectly shows itself in a wide range of temperatures. An alternative high-quality option is Transyn's transmission oil, the main feature of which can be called a high level of wear - 0.94.

How not to buy fake

Careful choice of oil according to characteristics and numerous parameters will be useless if you buy a fake produced in "Hoody" conditions. Such oil will not cope with its functions, and can also lead to accelerated wear and further breakage of the checkpoint.

When buying, be sure to check the manufacturer's date, the quality of the printed label and the presence of various marking. Plastic canister and lid must have a manufacturer's branded design. Preview the Internet, what the desired oil looks like. These several tips will help you buy original certified products.