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What would happen if you use motor oil instead of gear oil in a rear differental?
Wiki User
∙ 12y ago
It would be fine for a very long time, but eventually it may wear more than with a gear oil. Gear oil uses an additive that causes it to "stick" to the gears better than an engine oil so the gears that make contact above the the oil level will receive oil pulled up by a gear that does contact the oil bath. The biggest lubrication issue in designing a transmission/gearbox is ensuring that the bearings above the oil bath receive adequit oil. There lies the biggest issue with using a motor oil in a gearbox. With gear oil and a properly designed gearbox, the "sticky" oil will sling up to the higher shaft and stick to it, eventually flowing to the bearings. Motor oil will simply drip off the upper shaft before reaching the bearing. Sort of.
The "weights" of the oils are not relative, for instance a 75-90 gear oil is about the same viscosity as a, say a 20w40 motor oil. However, gear oil rarely reaches the test point of 200 degrees that engine oil does so it is rated at 150 degrees. If a 30w engine oil was rated at 150f, it would rate about the same as a 90w gear oil. There are exceptions, for instance a 600 hp Caterpillar diesel engine with 2400 lbs. ft. of torque in a big Peterbuilt truck pulling 80,000 lbs. over a mountain pass in 100 degree weather, they will see transmission and rear end oil temps of 250 degrees. However, they use a heavier 140w synthetic gear oil.
So, it is strongly recommended that a gear oil be used in a unit that requires oil to reach components that are above the oil level and there is no lubrication "system" in place, such as an oil pump, to deliver oil to the higher areas. Gear oil will stick to the lower components and carry the oil to the upper parts not bathed in the oil.
Wiki User
∙ 12y ago
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