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Copied from owners manual
Rear Axle (V6 Engine with Manual
Transmission)
Rear Differential Fluid 75W-90 Limited Slip (GM Part No. 89021677 and
Friction Modifier 1052358, in Canada 89021678 and
Friction Modifier 992694).
Rear Axle (SS)
Rear Differential Fluid 75W-90 Limited Slip (GM Part No. 89021677 and
Friction Modifier 1052358, in Canada 89021678 and
Friction Modifier 992694).
Rear Axle (ZL1)
Rear Differential Fluid 75W-90 Limited Slip (GM Part No. 88862624, in
Canada 88862625).
The TSB for the rear diff noise has the dealer replace the oil in the diffs of the SS cars with 88862624. Already in the ZL1!
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 Bryan 2018 ZL1 M6 |