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      11-28-2011, 03:35 PM   #5
paradocs98
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Drives: 2014 991 Carrera S
Join Date: May 2009
Location: NY

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95% chance it's the differential. My E60 M5 did this as well and it drove me nuts until I figured it out--I thought it was my tires rubbing on the plastic inner fender liner. As stated above, it's a known BMW service bulletin and should be taken care of with the updated diff oil.