Going to change the rear differential lube as soon as I figure out WHAT to stick in there.
I know the "WHAT oil should I use?" posts turn into a goat rope in short order. Not only here , but on the gun forums too. Lots of opinions.
The GM #88862624 has the ADDITIVE already mixed in.
Is there definitive proof that Royal Purple or the Amsoil lube is truly BETTER?
