Quote:
Originally Posted by BowlingSS
That just gives you:
Rear Differential Fluid 75W-90 Limited Slip to GM Specification 9986226.
GM Part No. U.S. 89021677 and Friction Modifier 1052358,
in Canada 89021678 and Friction Modifier 992694.
It does not give you brands.
I have some Castrol 75w-90 Synthetic gear oil that I need to check before I change mine.
Bill
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That's because, iirc, the only "certified" gear oil is GM-spec. You can put other stuff in there, and I'm sure it'll work fine...But if there's ever a problem and the dealer finds out -- whoosh goes your warranty coverage.
Engine oils are different but must meet the GM dexos requirements.