Interesting - I had this similar problem and it turned out to be inner CV's Easy to check, just see if you can wiggle the front axle shaft, if there is play you may need to replace. I had notorius vibes and finally got the right diagnosis. NOW, what to replace both front axle shafts with? OEM BMW @695 each or GKOLodno 295. each or Bav Auto aftermarket Chinese made @99. each?

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X5 3.0 AUTO -2001 - 238,000 miles