In reply to:
Why do you believe that synthetic gear lube is a waste of time?
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I think he's saying that because he changes it frequently and it costs more. Not making it worth it to him.
I have changed my rear diff fluid three times in the street sammy and I have owned it since the end of November. That isn't the usual for me. But one morning in Janurary it was a chunk of ice. I had changed it in December when I did some deep water wheeling. I can't figure out why it had water in it again, I don't remember wheeling any watery spots but oil doesn't usually freeze like that.