What type of fluid is commonly used to ensure proper lubrication of the gears in the gearbox and the differential?

Question

DentroTest · Accepted Answer

The gears of the gearbox and of the differential bevel gear unit withstand extreme mechanical pressures and great friction between their metal teeth. They therefore require a thick lubricant with additives to resist severe pressures, commonly called gear oil (valvulina) or high-viscosity extreme-pressure (EP) oil. The conventional oil from the engine sump does not have the viscosity or the additives suited to these loads, and a low-viscosity, low-pressure oil would break the lubricating film and cause rapid wear and failure of the system.

What type of fluid is commonly used to ensure proper lubrication of the gears in the gearbox and the differential?

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