Can I mix oill weights?

Bill in Utah

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 Originally Posted By: FastSUV
Lets say gear oil in this case...can I mix 80w90 with 85w140 with no ill effects?
I hope so. I've just got doing that to get rid of a whine in my 2007 rear diff using Amsoil 75-90 gear oil. About 1/2 of a quart of the 145wt stuff quieted it right down. It is safe. Try to stay within the same brand though. Esp with motor oils. Bill
 
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