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diff help problem oil

  1. E60 M5 and E61 M5 Touring Discussion
    So, I had some grinding noises at low speeds from cold start when turning right. Spoke to my Indy who recommended the BMW friction modifier diff oil change. Did that and it is 10x worse, now in both directions. 200 miles and more clockwise and counterclockwise turns than I can remember and...
  2. E60 M5 and E61 M5 Touring Discussion
    Hi Anyone had grinding noise after changed oil for upgraded? I changed oil about a year ego and the problem's back. Whot to do? many thanks:dunno:
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