1, lubrication wear reduction: between the piston and the cylinder, between the main shaft and the bearing are fast relative sliding, to prevent the parts too fast wear, you need to establish an oil film between the two sliding surfaces. There is a sufficient thickness of the oil film to separate the surface of the relative sliding part, so as to reduce the purpose of wear.

2, cooling and cooling: the oil can bring the heat back to the oil tank and then distribute it to the air to help the water tank cool the engine.

3, cleaning and cleaning: Good oil can be the engine parts on the carbide, sludge, wear metal particles through the cycle back to the tank, through the flow of lubricating oil, wash the parts of the working surface of the dirt.

4, sealing leakage: the oil can form a sealing ring between the piston ring and the piston, reducing the leakage of gas and preventing external pollutants from entering.

5, rust and corrosion prevention: lubricating oil can be adsorbed on the surface of the parts to prevent water, air, acidic substances and harmful gases from contact with the parts.

6, shock absorption buffer: when the engine cylinder port pressure rises sharply, suddenly aggravate the piston, piston chips, connecting rod and crankshaft bearing on the load is very large, this load through the bearing transmission lubrication, so that the impact load to withstand the buffer role.

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