Rear differential fluids

carbob08

New member
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19
3
Washington
Buick Ownership
2018 TourX
I was at a dealer today and asked what fluids are used in the rear differential since the owners manual says nothing. Here is what I found:
75w-90 Dexron LS p/n 88862624
According to the Corvette forums, this is a group ii/iii oil made by Petro Canada marketed as full synthetic with limited slip additive.
The Twinster clutches use Pentosin CHF 11S p/n 88901975
I didn't find quantities used for either fluid.
 
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