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What oil for 4 x stroke engines. Motor oil features for four-stroke engine

14.11.2019
34609 07/28/2019 7 min.

One of the main factors affecting the engine resource internal combustion, is the quality motor oil and the deadlines for its replacement. To understand which oil is better to pour into the engine of the fiberboard, you need to prevent the specifics of its device and work well.

Specific requirements

Most modern motoblocks (Motoblock rating can be studied in this article) equipped with four-stroke gasoline enginesnot having in its design oil pump.

The bottom head of the connecting rod, which is a sliding bearing, is lubricated by the oil with a special protrusion on the bottom cover of the connecting rod, the native crankshaft bearings, the gas distribution mechanism and the cylindropional group are lubricated with the splashes.

Also these engines have unstable temperature mode Due to air cooling.

For more information about the 4-tact engine, see the video:

Thus, engine oil for 4 clock engines Motoblocks must meet the following requirements:

  • Low kinematic viscosity in a large temperature range is needed to avoid oil starvation when driving the engine to operating temperature.
  • The use of viscous oils in engines that do not have lubricants under pressure can lead to a burden on the surface of the connecting rod cervix followed by metal tooling at this place and engine jamming.
  • The stable composition of the package of anti-friction and native additives will allow the oil for a long time to maintain its properties with regular cooling heating cycles during the operation of the motoblock.
  • The high strength of the oil film is necessary to protect the cylindrophone group from the jackets when the engine overheating during hard work in hot weather.
  • The detergents provided by the appropriate package of additives should counteract the fallout of the precipitate and the lacquer formations in the engine pallet and on the surfaces wetted surfaces.
  • Low coking is relevant for engines with air cooledsince the oil falling into the zone piston rings, heats up in this place to a temperature of 270-300 degrees.
  • Nagar's education will lead to the loss of mobility of piston rings and reduce compression with simultaneous oil overrun.

Based on these requirements, you can describe technical requirementswhich must match the oil for 4-stroke engines of motoblocks, so:

  • The class of high-temperature viscosity on SAE is not more than 30 in temperate climates, 40 - in hot. Low-temperature viscosity index - no more than 10W. These requirements are satisfied with the common oils of Types of 10W30, 5W30, 0W30, 5W40, 10W40 (the last two - at temperatures of 30 or more degrees).
  • Pure summer options - SAE 30, SAE 40. It is necessary to carefully read the characteristics of the oils: a number of specialized oils for garden equipment with a viscosity of 5W30 are intended solely for winter use.
  • The base of oil: synthetic or semi-synthetic, as in the specified viscosions of viscosity, mineral oils are practically not found. In addition, they have significantly worse stability compared to synthetics and semi-synthetic.
  • A number of manufacturers lubricants They have special lineage oils for garden equipment on a mineral base, in this case low cost in the opposite direction in the form of a frequent replacement.
  • Quality class according to API (a complex parameter that defines antifriction, anti-plating and detergent properties of engine oil, as well as many other parameters) not lower than SG.

It should be understood that all the requirements for motor oils for Motoblock Kaiman, Texas, foreman, Viking, Sadko, Don, Profi, Carver and respond to common car oils, the only difference can be its flow rate and the amount of cargo formed during long-term operation in the air cooling engine.

For this reason, although this material also considers specialized lubricants, in the absence of the possibility of their acquisition you can always use the corresponding automotive engine oils described.

Classification of oils

Husqvarna SAE 30, Husqvarna Universal SAE 30

Mineral motor oil produced by the Swedish company both for the factory refueling of its products and for subsequent maintenance. It is indicated by the use of a specially selected package of antifriction additives.

The minitractor is very popular and widely used in housing and communal services, on construction sites, in rural works and production. Minitractor scout is very durable, economical and durable technique.

For effective clearing of territory from snowdrifts, there are many models of tireless snowmobile machines. Everything is about the manual electrical snow blower.

KAMAZ 65115 refers to one of the oldest episodes of this plant, the issues of which began in 1998. By clicking on the link, familiarize yourself with the specifics of the work, the advantages and disadvantages of KAMAZ 65115.

Not suitable for operation of motorized equipment at low temperatures. Package price of 0.6 l - from 390 to 410 p.

Patriot Supreme HD SAE 30

This oil, also produced by one of the well-known American manufacturers of garden equipment, is intended for summer exploitation in gasoline and diesel motoblocks, mowers, minitractors. For ease of use, the package has a long nose. The base of oil is mineral. Package price 0.95 L - within 340 rubles.

Patriot Specific High-Tech 5W-30

Semi-synthetic engine oil for year-round operation of garden equipment with four-stroke engines: Motoblocks, minitractors, snow removal machinery

The class of low-temperature viscosity is 5Wregates the oil freezing temperature of at least -38˚ C.

Package price of 0.95 l - about 410 p. This oil It is used for the motoblock of Patriot Ural, Patriot.

Patriot Expert High - Tech SAE 10W40

Synthetic oil for operation of garden equipment in a hot climate and at elevated loads, for example, when plowing large areas of Earth Plow. Package price 0.95 L - 420 rubles.

Home Garden 4 Stroke Oil HD SAE 30

Available for the price of mineral-based summer engine oil. The price of a liter jar - 240-250 r.

ELITECH 4T Premium SAE 10W30

Semi-synthetic engine oil for year-round operation of motorcycles. Includes antifriction additives based on the Molybdenum disulfide, which, on the one hand, provides good protection of the engine from wear, on the other - requires an attentive relationship to the timing of oil replacement.

The price of liter packaging is 420 rubles, packaging in 0.6 liters - 340 rubles.

Elitech 4TD SAE30 Standard


Summer mineral oilAlso includes a package of molybdenum-containing additives. Lyric packaging of this oil costs about 300 rubles.

Elitech 4tdultrasae 5W30

Oil 4-stroke for engines of motor-blocks, year-round used in the most difficult jobs. Has a synthetic foundation. Package price of 0.6 l - 480 rubles.

Enem SAE 5W30.

Available synthetic engine oil from a domestic manufacturer, which can be used in motoblocks and other techniques with petrol engines In the summer and winter. Price of liter packaging - 380 p.

Enem SAE30.

Cheap summer oil from a group of mineral lubricants. The price of 180 rubles per liter allows you to compensate for its average quality more frequent replacements.

Encore SAE 10W40.

Unlike most motor oils for garden equipment, this oil has an APISJ / CF certification, which allows to compare its composition and quality with conventional budget car masses. Double certification indicates applicability not only in gasoline (SJ), but also in diesel (CF) engines.

A relatively high high temperature viscosity makes it unwanted using this oil at moderate and low temperatures. The main advantage of this oil is low price: Total 200 rubles per liter.

REZOIL PREMIUM SAE 5W30

Domestic semi-synthetic oil For gasoline and diesel gardening equipment (corresponds to the APISJ / CF specification). Due to low viscosity in a wide range of temperatures, it can work perfectly in motors with lubricator lubricant both in summer and in winter. The capacity of 0.95 liters is within 210 rubles.

REZOILRANCERUNILITESAE 30.

Exceptionally summer oil for gasoline and diesel motoblocks and minitractors. The type of foundation is not specified on the package, but the price of 140 rubles for 0.95 liters causes it to assume that this oil is mineral.

Rezoil Titanium SAE 10W-40

This semi-synthetic oil can also be used in gasoline and diesel enginesBut the viscosity index directly indicates the undesirableness of its use in a moderate climate. Packaging in 0.95 l volume costs 200 rubles.

Maxcut 4thdsae 30.

Summer mineral oil from a little-known manufacturer in Russia promising an increased content of antifriction additives and the possibility of using oil in highly loaded gasoline and diesel engines. The price of a liter jar is 240 rubles.

MANNOL ENERGY SAE 5W30

The famous auto chemical manufacturer from Germany has a line of engine oils for garden equipment. This semi-synthetic oil can be used in any sad technique With four-stroke engines throughout the year. Lyric packaging will cost an average of 420 rubles.

MANNOLMOLIBDENBENZINSAE 10W40 for four-stroke engines with air cooling

The semi-synthetic oil, the composition of which is improved by using a package of antifriction additives based on the Molybdenum disulfide. In the motoblocks it is worth using during hard work on hot weather. A liter of this oil costs 330 rubles.

Four-stroke oil Champion 4-Cycle SAE 30

This company from the United States also does not need special performances. This mineral oil is designed for years of operation in motoblocks, trimmers and lawn mile. Packing 0.6 l (250 rubles) and 1 liter (360 rubles).

Champion (champion) SnowThrower 5W30 for engine from a motor-block or cultivator

Mineral base engine oil, calculated exclusively on winter operation. It is noteworthy that at the time of release it was certified by the strictest at that time the APISL quality standard. Lyric packaging costs about 380 rubles. This oil is recommended for a motoblock.

Summer mineral oil from the famous Russian-Chinese brand. The quality of the product describes the certification according to the outdated APISG / CD standard, which to some extent pays off low price (180 rubles per liter).

It will be a good option in easy work, especially if the engine of the motor-block or cultivator is noticeably worn out. Use in difficult working conditions this oil is not worth it.

Caliber semi-synthetic SAE 5W30

Winter oil from the same manufacturer on a semi-synthetic basis. A more perfect base made it possible to reach the quality to an acceptable APISJ / CF standard. At the same time, the manufacturer shows a fairly low flash point - 228 ° C, which means its high evaporation and, accordingly, considerable consumption of a voligator.

The price is comparable to other oils of this quality group - 240 rubles per liter.

How much to fill

Most of the motoblocks presented on russian market, equipped with engines of the Hondagx family, their Chinese clones or similar to the construction of Subaru-Robin motors.

For a single complete refueling of oil such a motor, no more than 0.6 liters of oil will be required - that is why such a volume of packaging is popular with manufacturers. More powerful modifications of these motors can accommodate liter and more oils.

Row of engines, the design of which includes an additional lowering gearbox, have separate space For his lubricant.

Table of filling volumes for original Honda engines (Honda) and similar Chinese

SUBARU engines

If your motor-block is equipped with Briggs & Stratton Engine

Replacement

Replacing the oil in the motor motor motor is carried out with the frequency indicated in its operating manual, it is usually 60-80 hours. The specified interval should be reduced under severe working conditions or the use of cheap mineral oils.

Before replacing the oil on the motoblock, place it so that the engine is horizontally, and warm the engine so that the oil is better fastened. Then turn the plug of oilseabolic neck and drain plug, Substituting the capacity of the appropriate volume under it.

Be careful not to burn hot oil.

After waiting for the moment when the exhaust oil stops dripping, wrap the drain plug in place and flush through the clean funnel to the crankcase fresh oil, guided by the passport volume and tags on the dipstick of the oil refining neck.

Since the engine lubricant is carried out only by spraying the oil from the crankshaft, strive to always maintain the oil level on the Maximum label. Low-locked filled holes without probe must be filled with oil until it appears on the thread.

If the motor-block engine is equipped with a downward gearbox, do the same operations with it. Most often the gearbox does not have an oil probe, and in order to measure the right amount Oils, take advantage of a small capacity of the known volume.

Oil selection for four-stroke engines With air-cooled, this is a separate topic that is not only interested in car enthusiasts, but also of all owners of light technology. It includes how motorboats and motorcycles and many variants of modern garden equipment.

Initially, let's say about the differences between water and air cooling motors. The load temperature on the piston group of the engine in the four-stroke engines of air cooling is much higher than their water fellows, so the requirements for the quality of oil for "air" grows at times.

First of all, oils have the opportunity immediately at start-up to form a protective film, even if the engine has already passed the correct run and launched on all technonems. For non-deployment, dare remind you that oil for two-stroke engines You should not use four-strokes. In the first case, it is mixed with gasoline before work, in the second, on the contrary, the initial mixing with the fuel is not allowed, since the technique has a separate lubricant system and the protection of elements of particularly susceptible to friction.

Gradation oils for four-stroke engines

Oil selection for 4 stroke engines with air cooling motor lubricant for auto. Gosban classification has long been adapted to world performance on SAE, so all manufacturers of such lubricants on the package are written by this particular characteristic of climatic and temperature use.

Despite the fact that in the winter period four-stroke aggregates are used less, oils for them are made enough in a wide range. Next, the unified parameters for choosing oil for four-stroke engines with air-cooled, on the basis of which it is easy to choose its own, guided by the recommendations of the manufacturer of the technicians marked in the service book.

  • 4td series engine oil - Special development for four-stroke air cooling engines with diesel or gasoline fuel.

The base is based on polyalphaolefin oils of deep purification of mineral or completely synthetic nature. Packages of additives are used to the high-quality base complex that provide increased engine protection from deposits on a piston system and a motor crankcase, oppose the rings to the rings and tend to reduce power consumption by aggregates. The peculiarity of this group of oils is high resistance to heat-oxidation, in a compartment with increased wear protection, due to the contamination of additives.

Mineral oil 4TD.

  • 4td Series Engine Oil SAE 30 Standard - Fully natural mineral lubricant for four-stroke air cooling engines.

It is shown for the use of high operating and temperature loads in the summer season. It has prolonged protective Properties In the temperature range from -10 to +40 degrees Celsius.

Semi-synthetic oil 4td.

  • Oil for the 4TD Series Series Premium SAE 10W-30 - high-quality semi-synthetic oil for four-stroke air cooling engines with all-season use.

Limit climatic temperatures are between -25 to +40 degrees, which allows you to expand the scope of application. The main difference from mineral oils is the instant formation of a protective oil film between all driving engine parts immediately at startup. The good structure of the foundation allows you to resist high-temperature sediments and oxidation.

Synthetic oil 4TD.

  • Oil for the 4TD Series Series Ultra SAE 5W-30 - Fully synthetic lubricant for four-stroke air cooling engines made on the basis special oils With a frost-resistant formula.

Refers to all-season oils with operating temperatures from -38 to +50 degrees. Distinctive feature Synthetic lubricants of this class - easy start and quick engine warming with high protection (completely eliminates overheats in any weather) In the active mode on / off.

All oil classes for four-stroke air cooling engines have a common feature when used - it is effective from the encounter of the mechanisms of force aggregates due to the stable structure of the original formula.

In addition, there are excellent anti-raising indicators even subject to work in an aggressive environment and constant overloads. Reducing wear and protection against sediments of various nature allows you to use lightweight technique for a long time, at the same time the oil significantly reduces power consumption power aggregateWhat is profitable for the owner.

34609 07/28/2019 7 min.

One of the main factors affecting the resource of the internal combustion engine is the quality of engine oil and its replacement. To understand which oil is better to pour into the engine of the fiberboard, you need to prevent the specifics of its device and work well.

Specific requirements

Most modern motoblocks (can be studied in this article) are equipped with four-stroke gasoline engines that do not have in their design of the oil pump.

The bottom head of the connecting rod, which is a sliding bearing, is lubricated by the oil with a special protrusion on the bottom cover of the connecting rod, the native crankshaft bearings, the gas distribution mechanism and the cylindropional group are lubricated with the splashes.

Also these engines have an unstable temperature due to air cooling.

For more information about the 4-tact engine, see the video:

Thus, the engine oil for 4-tact engines of motoblocks should meet the following requirements:

  • Low kinematic viscosity in a large temperature range is needed to avoid oil starvation when driving the engine to operating temperature.
  • The use of viscous oils in engines that do not have lubricants under pressure can lead to a burden on the surface of the connecting rod cervix followed by metal tooling at this place and engine jamming.
  • The stable composition of the package of anti-friction and native additives will allow the oil for a long time to maintain its properties with regular cooling heating cycles during the operation of the motoblock.
  • The high strength of the oil film is necessary to protect the cylindrophone group from the jackets when the engine overheating during hard work in hot weather.
  • The detergents provided by the appropriate package of additives should counteract the fallout of the precipitate and the lacquer formations in the engine pallet and on the surfaces wetted surfaces.
  • Low coking is relevant for air-cooled engines, since the oil falling into the piston rings zone is heated in this place to a temperature of 270-300 degrees.
  • Nagar's education will lead to the loss of mobility of piston rings and reduce compression with simultaneous oil overrun.

Based on these requirements, it is possible to describe the technical requirements that must match the oil for 4-stroke engines of the motoblocks, so:

  • The class of high-temperature viscosity on SAE is not more than 30 in temperate climates, 40 - in hot. Low-temperature viscosity index - no more than 10W. These requirements are satisfied with the common oils of Types of 10W30, 5W30, 0W30, 5W40, 10W40 (the last two - at temperatures of 30 or more degrees).
  • Pure summer options - SAE 30, SAE 40. It is necessary to carefully read the characteristics of the oils: a number of specialized oils for garden equipment with a viscosity of 5W30 are intended solely for winter use.
  • The base of oil: synthetic or semi-synthetic, as in the specified viscosions of viscosity, mineral oils are practically not found. In addition, they have significantly worse stability compared to synthetics and semi-synthetic.
  • A number of manufacturers of lubricants have special line of oils for garden equipment on a mineral base, in this case low cost in the opposite direction in the form of a frequent replacement.
  • Quality class according to API (a complex parameter that defines antifriction, anti-plating and detergent properties of engine oil, as well as many other parameters) not lower than SG.

It should be understood that all the requirements for motor oils for motoblocks, and are associated with common automotive oils, the only difference can be its consumption and the amount of carpent formed during long-term operation in the air cooling engine.

For this reason, although this material also considers specialized lubricants, in the absence of the possibility of their acquisition you can always use the corresponding automotive engine oils described.

Classification of oils

Husqvarna SAE 30, Husqvarna Universal SAE 30

Mineral motor oil produced by the Swedish company both for the factory refueling of its products and for subsequent maintenance. It is indicated by the use of a specially selected package of antifriction additives.

The minitractor is very popular and widely used in housing and communal services, on construction sites, in rural works and production. The minitractor is very durable, economical and durable technique.

For effective clearing of territory from snowdrifts, there are many models of tireless snowmobile machines. Everything is about the manual electrical snow blower.

KAMAZ 65115 refers to one of the oldest episodes of this plant, the issues of which began in 1998. Crossing to familiarize yourself with the specifics of the work, the advantages and disadvantages of KAMAZ 65115.

Not suitable for operation of motorized equipment at low temperatures. Package price of 0.6 l - from 390 to 410 p.

Patriot Supreme HD SAE 30

This oil, also produced by one of the well-known American manufacturers of garden equipment, is intended for summer exploitation in gasoline and diesel motoblocks, mowers, minitractors. For ease of use, the package has a long nose. The base of oil is mineral. Package price 0.95 L - within 340 rubles.

Patriot Specific High-Tech 5W-30

Semi-synthetic engine oil for year-round operation of garden equipment with four-stroke engines: Motoblocks, minitractors, snow removal machinery

The class of low-temperature viscosity is 5Wregates the oil freezing temperature of at least -38˚ C.

Package price of 0.95 l - about 410 p. This oil is used for the motoblock ,.

Patriot Expert High - Tech SAE 10W40

Synthetic oil for operation of garden equipment in a hot climate and at elevated loads, for example, when plowing large areas of Earth Plow. Package price 0.95 L - 420 rubles.

Home Garden 4 Stroke Oil HD SAE 30

Available for the price of mineral-based summer engine oil. The price of a liter jar - 240-250 r.

ELITECH 4T Premium SAE 10W30

Semi-synthetic engine oil for year-round operation of motorcycles. Includes antifriction additives based on the Molybdenum disulfide, which, on the one hand, provides good protection of the engine from wear, on the other - requires an attentive relationship to the timing of oil replacement.

The price of liter packaging is 420 rubles, packaging in 0.6 liters - 340 rubles.

Elitech 4TD SAE30 Standard


Summer mineral oil, also includes a package of molybdenum-containing additives. Lyric packaging of this oil costs about 300 rubles.

Elitech 4tdultrasae 5W30

Oil 4-stroke for engines of motor-blocks, year-round used in the most difficult jobs. Has a synthetic foundation. Package price of 0.6 l - 480 rubles.

Enem SAE 5W30.

Affordable synthetic engine oil from a domestic manufacturer, which can be used in motoblocks and other techniques with gasoline engines in summer and winter. Price of liter packaging - 380 p.

Enem SAE30.

Cheap summer oil from a group of mineral lubricants. The price of 180 rubles per liter allows you to compensate for its average quality more frequent replacements.

Encore SAE 10W40.

Unlike most motor oils for garden equipment, this oil has an APISJ / CF certification, which allows to compare its composition and quality with conventional budget automotive oils. Double certification indicates applicability not only in gasoline (SJ), but also in diesel (CF) engines.

A relatively high high temperature viscosity makes it unwanted using this oil at moderate and low temperatures. The main advantage of this oil is low price: only 200 rubles per liter.

REZOIL PREMIUM SAE 5W30

Domestic semi-synthetic oil for gasoline and diesel engineering equipment (complies with the APISJ / CF specification). Due to low viscosity in a wide range of temperatures, it can work perfectly in motors with lubricator lubricant both in summer and in winter. The capacity of 0.95 liters is within 210 rubles.

REZOILRANCERUNILITESAE 30.

Exceptionally summer oil for gasoline and diesel motoblocks and minitractors. The type of foundation is not specified on the package, but the price of 140 rubles for 0.95 liters causes it to assume that this oil is mineral.

Rezoil Titanium SAE 10W-40

This semi-synthetic oil can also be used in gasoline and diesel engines, but the viscosity index directly indicates the undesirableness of its use in a moderate climate. Packaging in 0.95 l volume costs 200 rubles.

Maxcut 4thdsae 30.

Summer mineral oil from a little-known manufacturer in Russia promising an increased content of antifriction additives and the possibility of using oil in highly loaded gasoline and diesel engines. The price of a liter jar is 240 rubles.

MANNOL ENERGY SAE 5W30

The famous auto chemical manufacturer from Germany has a line of engine oils for garden equipment. This semi-synthetic oil can be used in any garden technique with four-stroke engines throughout the year. Lyric packaging will cost an average of 420 rubles.

MANNOLMOLIBDENBENZINSAE 10W40 for four-stroke engines with air cooling

The semi-synthetic oil, the composition of which is improved by using a package of antifriction additives based on the Molybdenum disulfide. In the motoblocks it is worth using during hard work on hot weather. A liter of this oil costs 330 rubles.

Four-stroke oil Champion 4-Cycle SAE 30

This company from the United States also does not need special performances. This mineral oil is designed for years of operation in motoblocks, trimmers and lawn mile. Packing 0.6 l (250 rubles) and 1 liter (360 rubles).

Champion (champion) SnowThrower 5W30 for engine from a motor-block or cultivator

Mineral base engine oil, calculated exclusively for winter operation. It is noteworthy that at the time of release it was certified by the strictest at that time the APISL quality standard. Lyric packaging costs about 380 rubles. This oil is recommended for a motoblock.

Summer mineral oil from the famous Russian-Chinese brand. The quality of the product describes the certification according to the outdated APISG / CD standard, which to some extent pays off low price (180 rubles per liter).

It will be a good option in easy work, especially if the engine of the motor-block or cultivator is noticeably worn out. Use in difficult working conditions this oil is not worth it.

Caliber semi-synthetic SAE 5W30

Winter oil from the same manufacturer on a semi-synthetic basis. A more perfect base made it possible to reach the quality to an acceptable APISJ / CF standard. At the same time, the manufacturer shows a fairly low flash point - 228 ° C, which means its high evaporation and, accordingly, considerable consumption of a voligator.

The price is comparable to other oils of this quality group - 240 rubles per liter.

How much to fill

Most of the motoblocks presented in the Russian market are equipped with the engines of the Hondagx family, their Chinese clones or similar to the construction of Subaru-Robin motors.

For a single complete refueling of oil such a motor, no more than 0.6 liters of oil will be required - that is why such a volume of packaging is popular with manufacturers. More powerful modifications of these motors can accommodate liter and more oils.

A number of engines, the design of which includes an additional lowering gearbox, have a separate space for lubricant.

Table of filling volumes for original Honda engines (Honda) and similar Chinese

SUBARU engines

If your motor-block is equipped with Briggs & Stratton Engine

Replacement

Replacing the oil in the motor motor motor is carried out with the frequency indicated in its operating manual, it is usually 60-80 hours. The specified interval should be reduced under severe working conditions or the use of cheap mineral oils.

Before replacing the oil on the motoblock, place it so that the engine is horizontally, and warm the engine so that the oil is better fastened. Then turn the plug of the oil-coaling neck and the drain plug, substituting the tank of the appropriate volume under it.

Be careful not to burn hot oil.

After waiting for the moment when the exhaust oil stops dripping, wrap the drain plug in place and flush through the clean funnel to the crankcase fresh oil, guided by the passport volume and tags on the dipstick of the oil refining neck.

Since the engine lubricant is carried out only by spraying the oil from the crankshaft, strive to always maintain the oil level on the Maximum label. Low-locked filled holes without probe must be filled with oil until it appears on the thread.

If the motor-block engine is equipped with a downward gearbox, do the same operations with it. Most often, the gearbox does not have an oil probe, and in order to measure the desired amount of oil, use the small capacity of the known volume.