I have and will always use 10w-30 in the summer and 5w-30 in the winter.
I have been using Royal Purple 75w-90 in my diffs but I have seen a lot of posts of people using the mobil-1 ??w-140
2001 Ironman Daily Driver... 3.5" suspension lift (OME912 springs and 1" spring spacer), ball joint flip, 1.5" front diff. drop, 33"x12.5 TrXus MT, 16x10 Eagle Alloy rims, Interceptor, PV muffler, K&N air filter, Alpine Supercharger, Bilstein shocks, and some trimming.
2000 Ironman Project LS-1 VX... very slow progress but someday....... ohhhhh someday......
Super VXer
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