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      05-20-2018, 01:13 PM   #2
Bartledoo
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Drives: 2011 E90 M3 6MT
Join Date: Aug 2015
Location: Seattle, WA

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That sounds similar to what mine does occasionally/randomly as well, usually after being warmed up for a while. I shrugged it off as one of the "weird but normal sounds" for this engine. It's been that way for as long as I can remember.
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