What are the benefits of engine oil?

[DelZane]

The benefits of engine oil include: 1. A sufficiently thick oil film separates the surfaces of relatively sliding parts, thereby reducing wear; 2. Engine oil can form a sealing ring between the piston ring and the piston, reducing gas leakage and preventing external contaminants from entering; 3. Lubricating oil can adhere to the surface of parts, preventing contact with water, air, acidic substances, and harmful gases; 4. When the pressure in the engine cylinder port rises sharply, suddenly increasing the load on the piston, piston skirt, connecting rod, and crankshaft bearings, this load is transmitted and lubricated through the bearings, cushioning the impact load; 5. It can carry away carbon deposits, sludge, and worn metal particles from engine parts back to the oil tank through circulation, and flush away dirt generated on the working surfaces of parts through the flow of the lubricating oil.