Motor oil must have high lubricity and thereby ensure the maximum reduction of friction and wear reduction;
An important function of engine oil is the ability to clean the engine from wear debris, soot and other oil insoluble particles. For this purpose, special additives are added to motor oil which envelop the dirt particles and prevent them from sticking together in large clumps. Contaminations in engine oil are in a suspended state, allowing them to freely fall into the oil filter and settle on its filter element;
The engine water vapor is always present inside, which condensing on the metal surface cause corrosion. Protection against corrosion – another important function of engine oil;
Due to the fact that the fuel contains sulfur, acid is formed during the combustion. Engine oil is also responsible for neutralization of this acid.