Engine oil, engine oil or engine lubricating oil is a kind of substance reinforced by additives in base oil, which mainly contains anti-wear additives, detergents, dispersants and multistage engine oil viscosity index improvers. Engine oil is used to lubricate internal combustion engines.
The main function of engine oil is to reduce the friction and wear of moving parts, and to remove sludge (one of the functions of dispersant) and paint (cleaner) from the engine. It can also neutralize the acid (detergent) produced by the oxidation of fuel and lubricant, improve the sealing performance of piston ring, and cool the engine by taking away the heat of moving parts.
In addition to the basic components mentioned in the previous paragraph, almost all lubricating oils contain corrosion (rust) and oxidation inhibitors. Engine oil can only consist of lubricating base oil, and does not include cleaning oil components; Or composed of lubricating base oil and additives, so as to improve the detergency, extreme pressure performance and corrosion resistance of engine parts.