• Read about some kind of magic oil for the diff that I'm gonna give a go, guess fresh gearbox oil can't harm

  • No magic oil helps, sawdust might ;)

    Maybe look at synthetic oils, helped in a few older gearboxes.

    Edit - checked the engine mounts?

  • BMW M3s have a problem with clonking diffs, especially cornering caused by the slip diff plates grabbing and catching, the new oil for them helps stop it.

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