Hello, after searching and researching the many posts about this, it appears the consensus is to use Mobil 1 75 w 90 synthetic, so I changed it with that last week.

Now, differential seems louder.... has anyone else experienced this? any suggestions? go to dealer and get the hypoid oil? do it again, with heavier?

History: I bought the car about a year ago with 125,000 miles, daily driver, now has 133,000.. appears had never been changed before, so I thought it would be a good idea. manual transmission, fwiw.

thanks

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Austin, TX
81 240d dd
89 560sel sold