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use what GM recommends for the rear diff...the synthetic isn't better if it doesn't have the appropriate additive. It is simple to change and you can change it more often with the 88862624. I had a '15 Z/28 which had the rear that required the synthetic you list above. Gear oil isn't like engine oil so the "synthetic has to be better" thing is not a worry at all. Clean gear oil in the diff is the most important so swap it at 500mi & 1500mi when the car is new. After break in follow GM's protocol for track use diff fluid changes or swap it yearly if there is no track use.
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'21 ZLE A10 Wild Cherry PDR 2:00.78 VIR Full 10.68@131.69 1.68 60'
'17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold)
'15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold)
'12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold)
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