All e46 M3's & e9x M3's have this noise, the additive is called FMBooster fixes the problem and is added when the diff oil is first serviced. Half smart dealers should know this!
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MY22 X5 M-Sport 45e White, 22"rims, Red Calipers, Ceramic Pads. Better off saying what it does not have and that's a B&O Audio System, otherwise all option boxes are ticked.
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