Quote:
Originally Posted by CWXC70
"and as a 75w-90 gear oil is roughly equal to a 10w-40 engine oil"
Is it?
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Engine and gear oil viscosities are measured on different scales. That much I know. If a oil expert says they are equivilent I'd be inclined to believe them.
Have a read through this if you're interested (or at least look at the graph):
http://www.bobistheoilguy.com/puttin...nto-viscosity/