I started using Mobil 1 in the engine at 10K and changed the tranny, diffs, and transfer over to Mobil 1 at 30K. Haven't had any problems with it yet and its at about 65K. I'll probably change out the diffs and what not again at 80K.

Axle
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My wife - "We haven't even made a payment on it yet and you're scratching it all up!"