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IMO, you can use 75W90 synthetic...GM or not...

I have Mobil1 for customer pay...GM grape juice for warranty repairs...



Adhesives, Fluids, Lubricants, and Sealers
Application
Type of Material
GM Part Number
Rear Drive Axle
Lubricant
SAE 75W-90 Synthetic Axle Lubricant 89021677 (Canadian P/N 89021678) or equivalent meeting GM Specification 9986115
Ring Gear
Marking Compound
1052351 (Canadian P/N 10953497) or equivalent
Pinion Gear Bearing Retainer
Sealant
1052942 (Canadian P/N 10953466) or equivalent
Pinion Yoke Splines
Sealant
12346004 (Canadian P/N 10953480) or equivalent
 
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