Auto gearbox ?
Had something similar on a E46 3 Series
Sounded like fan belt slipping shortly after start for up to about 2min.
Turned out to be the Auto gearbox and a software update of the gearbox solved the problem.
We were all certain the sound as coming from the engine, but was the gearbox running a incorrect mode after startup.
There were no other signs of problems, just the sound after startup and of course never did it at the dealer.
It was a little louder if you shifted into D right after starting which made me think of the gearbox months after the problem started.
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BMW if you are reading, I need a job, Please.
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