CarbonSteel
Well-Known Member
I am using Shell Spirax 85W-140 and Valvoline High Performance 85W-140 to break mine in. After I put about 5K on the axles (with multiple oil changes), I will be switching to Valvoline 75W-140 in the rear and 75W-90 in the front.The Diff shop I had put in my TruTrac uses 76MBP oil 85w140 in just about every differential that comes out of their shop.
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