Motor 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 affect oil consumption.
It is necessary to add oil when its level drops below the "MIN" mark on the dipstick.
It is also important to ensure that the oil level does not exceed the "MAX" mark 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.
If you frequently start the engine from a cold state, at the beginning of the movement, before the engine reaches operating temperature, the oil that flows back into the oil pan takes the fuel with it. The fuel "dissolves" the oil and its level rises.
This dissolved oil loses its lubricating ability and can cause engine damage if the prescribed oil change intervals are not followed.
Driving mainly in urban conditions, with an unheated engine, with a crankshaft speed higher than idle speed is the main reason for oil dilution.
Since oil consumption only stabilizes after several thousand kilometers, the amount of oil consumption cannot be determined accurately until the mileage reaches approximately 7,500 km.
Before measuring oil consumption, make sure the engine is not losing oil due to a leak.
The dipstick may only be used to check the oil level. The engine must be turned off for at least 5 minutes before checking the oil level. If after replacement the maximum volume of oil added does not correspond to the maximum level on the dipstick, this is due to the required manufacturing tolerances.
All information regarding the permissible consumption of engine oil and filling volumes can be found in the "User's Manual" and service book.
Verification procedure
1. To check, the vehicle must be parked on a horizontal surface and the engine must be warmed up to operating temperature (engine oil temperature not less than 80°C).
2. Drain the engine oil immediately after turning off the engine. Draining time is approximately 30 minutes (this value was obtained during technical tests).
3. The amount of drained engine oil is determined using a measuring container. The container is filled with new oil up 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 be enough for a mileage of 1000 km without the need for topping up (road conditions and driving style should not change).
5. After this, the previous procedure is repeated (pp. 1 and 2) with the same oil drain time.
6. The amount of oil now "missing" from the measuring container is equal to the engine oil consumption for that mileage.
7. Oil consumption is calculated as follows: amount of oil added (l) – amount of oil drained (l) + total mileage (km) x 1000 = oil consumption (l/1000 km).
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