I seem to recall reading it had something to do with the air conditioning? My wife's old 2013 f30 328i had that problem, but I haven't really noticed it on my 2015 e84 35i. She had the dealership do something to it, and it worked for a while, but eventually the smell came back. I just can't remember what they did, but thought it was something with the a/c. Sorry that's not super helpful...
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