Ah, another time that vanos can add noise and irritation to my life :-) My M3 had a similar issue, but it didn't go away once the engine ran for 2 seconds. I have a great aftermarket warranty that has been a life saver so I think I'll roll this one out on the dealership and see what they make of it.

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2013 X5 xDrive3.5i Premium
2002 530I Sport Package
2001 X5 4.4i
2001 M3