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      07-08-2008, 01:33 PM   #4
ben@tirerack
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Drives: 740i
Join Date: Mar 2008
Location: South Bend, IN

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Rust off the rotors is the likely culprit. Aluminum wheels do not rust in the same way that iron or steel does. Oxidization on aluminum is more blackish, not the orange-looking rust that comes from iron/steel.
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I have accepted a new position at Tire Rack and am no longer in the sales department. gary@tirerack.com is available to assist with M3 questions.