SAE 90 vs 75W-90 Is this OK???????? - Ford Powerstroke Diesel Forum
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Old 01-02-2012, 01:26 PM
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Question SAE 90 vs 75W-90 Is this OK????????

I am going to change the fluids in my front/rear differential and transfer case. I have looked in my manual for the proper viscosities and quantities. Question: My manual says to use SAE 90 in the front differential but I see folks seem to be using 75W-90. Is this acceptable and why? I have looked at several sites that reference using 75w-90 but none have indicated why this is OK?

Thanks for your help.
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Old 01-03-2012, 10:22 AM
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SAE 90 vs 75W-90



Anyone? Even a guess might be helpful. Thx
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Old 01-03-2012, 11:46 AM
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75w90/80w90 ain't gonna make a bit of difference. Run what you want the differential won't care one bit.
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