Quote:
Originally Posted by BrianMSmith
MT-90 is 75W90 and MTL is 70W80. So I do not think MTL is half the cold viscosity of MT-90. 70 vs 75.
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It is. The gear oil weights are weird.
MTL is the equivalent weight of 5W30 engine oil.
MT-90 is the equivalent weight of 15W40 engine oil.
MTL viscosity at 40C : 56 cSt
MT-90 viscosity at 40C : 90 cSt
There's even more disparity at room temperature or below.