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Diff noise resolution
I have a 08 E90 M3 and the dreaded diff clutch chatter started sometime after the 1200 miles service and was getting steadily worse. The dealer changed the diff lube over to the FM Boost version and the chatter was gone in about 100 miles. The dealer nor did I do any tight circles to try to acclerate remediation. IMO I would see if simply driving with FM Boost does the trick before trying to force it home with the tight circles. Seems like the tight circles might get the job done faster but add needless wear and tear.
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