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Hi, I spoke to some people and they swear the differentials should always be lubricated with standard "mineral" oil, but at 15k (as I wheel my FJ quite a bit) I replaced everything with mobil1 or royal purple synthetic (this is front diff, transfer case, rear diff, on a manual transmission).
I am at 30k now and I was wondering what I should do, back to standard or...?
I am at 30k now and I was wondering what I should do, back to standard or...?