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      05-17-2019, 04:10 PM   #8
OBRUT_3M
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Drives: 2016 M3
Join Date: Mar 2017
Location: NY NY

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I had the same issue on my 16' 6MT. Took it in 3 times and they could not figure it out. It was so loud sounded like something was grinding in the rear. Fortunately started to go away on its own after 10k miles or so.