Quote:
Originally Posted by DeliveryValve
Cheapest gear oil will work wonderfully on a dirty diff.
But synthetic oil in a dirty diff is a bad thing. I've seen this happen several times. I never blindly install synthetic oil in a diff that used conventional oil all it's life. I have to open it up first, look inside to see the condition and clean it out if necessary. Then install the synthetic oil.
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I don't have problem with members using synthetic oil. It is their money and they can spend it anyway they want. I can clean the diff all day, it will be dirty by the time I go round the block once. So I never bother.