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      09-28-2020, 03:57 PM   #12
bmwm3s65
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Drives: 2009 bmw m3 6spd
Join Date: Feb 2016
Location: USA

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just from my experience, I am probably totally off but, it sounds very similar to a sound I was experiencing and what some users were describing as pre-detonation in this thread https://www.m3post.com/forums/showthread.php?t=1532390 due to being tuned. Is it possible, that the car was tuned when you purchased it? I just had the number 1 rod bearing spin in my engine and the sound was consistent and very specific and different what you posted and I had lots of glitter and metal flakes. Good luck. I hope you find the source of the sound and it's something inexpensive.
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