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OP I am wondering about RP Synchromax as well. The OE gear oil in my 2017 SS is GM part# 88861800 from AC Delco (their part# is 10-4033) and is a 75w-90 viscosity. RP Synchromax has a viscosity rating of 10.
I have tried Royal Purple 75w-90 gear oil with limited results (helped the cold shifting for a while but didn't last). So I tried Motul, Amsoil, Mobil 1, etc. No joy in Muddville.
So I keep seeing folks referencing Synchromax as a better choice BUT if you review it closely, Royal Purple's specs say it's a 10 weight oil "recommended for manual transmissions that specify an automatic transmission fluid or motor oil" (Summit Racing). Like my '86 Camaro manual trans- but not specified for 6th Gen Camaros! Some retailers are using "automotive transmission fluid" I believe to muddy the water (oops! a misprint- obviously...not).
Royal Purple also proudly displays "High Performance Manual Transmission Fluid" but it is ONLY in those vehicles that specify they can use A(utomatic)TF.
Am I wrong about this??
Thanks in advance for your opinions, facts , or ideas.
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