I have a 2012 135i, 1700 miles, no issues whatsoever.
I do notice a rattling-type noise at cold startup. My prior M coupe did something similar. Did some research and discovered it was normal and related to the VANOS variable valve timing mechanisms prior to getting fully lubricated at cold startup. I can't hear your clip, but my hunch is that this is the same and probably normal for N55 based cars.
Last edited by blschaefer1; 08-14-2011 at 11:04 AM.