Engine oil is designed to separate friction surfaces with an oil film, that is, to prevent dry friction, as well as to remove heat generated by friction and remove combustion products.
All this leads to a gradual consumption of oil during engine operation.
In addition to operating conditions, driving style and manufacturing tolerances also affect oil consumption.
It is necessary to add oil when its level falls below the mark «MIN» on the level dipstick.
It is also important to ensure that the oil level does not exceed the mark «MAX» on the dipstick as this may result in increased oil consumption.
Since oil consumption is determined by technical factors, it can be concluded that the engine does not consume oil under certain operating conditions that lead to oil dilution.
Under the condition of frequent starts from a cold state, at the beginning of the movement, before the engine reaches operating temperature, the oil that enters back into the oil pan carries fuel with it. Fuel «dissolves» oil and the level rises.
Such diluted oil loses lubricity and can cause engine damage if prescribed oil change intervals are not followed.
Driving mainly in urban areas, with a cold engine, with a crankshaft speed above idle speed is the main cause of oil dilution.
Since oil consumption stabilizes only after several thousand kilometers, the oil consumption cannot be determined exactly until approximately 7,500 km have been driven.
Before measuring oil consumption, make sure that the engine is not losing oil due to leakage.
The dipstick can only be used to check the oil level. The engine must be turned off at least 5 minutes before checking the oil level. If, after replacement, the maximum amount of oil filled does not correspond to the maximum level on the dipstick, the reason for this is the necessary manufacturing tolerances.
All information regarding the permissible consumption of engine oil and filling volumes can be found in «User manual» and service book.
Verification procedure
1. To check the car must be installed on a horizontal surface, and the engine warmed up to operating temperature (engine oil temperature at least 80°C).
2. Drain the engine oil immediately after turning off the engine. Draining time - approximately 30 minutes (this value is obtained from technical tests).
3. The amount of drained engine oil is determined by means of a measuring container. The container is filled with new oil to the maximum filling volume, from which the volume of oil remaining in the oil filter is subtracted.
4. This amount of engine oil should last for 1000 km without the need to top up (road conditions and driving style should not change).
5. After that, the previous procedure is repeated (p.p. 1 and 2) with the same oil drain time.
6. The amount of oil, now «missing» in the measuring container, equal to the consumption of engine oil for this run.
7. Oil consumption is calculated as follows: the amount of oil filled (l) - amount of drained oil (l) + total mileage (km) x 1000 = oil consumption (l/1000 km).
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