The functions of motor oil mainly include the following.

Lubrication and wear reduction, the oil can form an oil film on the friction surface, reducing friction and wear between parts and preventing direct metal-to-metal contact.

Cooling, the oil absorbs the heat generated by friction and brings it back to the oil tank and then emits it to the air, helping to cool the engine.

Cleaning, oil circulation can take away the carbide, sludge, wear metal particles and other dirt on the engine parts to keep the engine clean.

Sealing leakage, oil in the piston ring and piston between the formation of a seal, reduce gas leakage and outside pollutants into.

Rust and corrosion prevention, the oil on the surface of the parts to form a film, preventing water, air, acidic substances and parts contact, to avoid corrosion and rust.

Shock absorption and cushioning, the oil absorbs the shock and vibration generated when the engine is running, reducing the damage to the engine.

In addition, the oil also has the role of auxiliary cooling, cleaning, sealing leakage, rust and corrosion prevention, shock absorption buffer, etc., known as the car's "blood".