Im using a Penrite Mineral oil "Limsip 85W-140" as was filled by a Diff shop i went to last year. Its back there now as im getting them to fit another locker for me But they have just found that the ring gear is stuffed! it has a slivered piece of metal that has sheered off the size of a 1 cent piece.
This is the Front Dana 30.
Im not sure if its just a bad set of aftermarket Superior Gears or i overloaded the Diff or its the OIL?
Nowhere do i see Mineral oil recommended and now im thinking should i go with Penrite SIN GEAR 75 (75w-90) or SIN GEAR 80 (80w-140) both Fully Synthetic Oils
The Diff shop are putting in Limsip 85w-140 again saying its all they use and its better than Synthetic! I asked about putting in Limsip 90 in the Front only but again they say 85w-140 is the only one i should be using in both.
Is anyone using Mineral Oil in their Diffs???
Last edited by ShortBlack; 11-08-2009 at 09:27 AM.
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