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The vehicle gear oil is a kind of lubricating oil. The main function is to reduce the friction and wear of the gear and bearing, increase the heat dissipation of the lubricating surface, and prevent the corrosion and corrosion of the machine parts. It is mainly used for lubricating all kinds of gears of transmission, reducer and differential in automobile and tractor transmission system. The viscosity of gear oil is larger than that of lubricating oil and slightly black, so it is also called black oil.