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I'm choosing to NOT follow the BMW recommendation. I'm driving it like I stole it, from the day I got it. I've had too many friends of mine that did the same with their new German cars and the results have been amazing. They all seem to have "ringers". They're all faster than other cars of the same make and model. My friends 2009 335i ran 13.53 ET at San Antonio Raceway. Another buddy in his S4 ran 13.19!
I no longer believe these modern cars need a real break-in period. I was instructed by an engine builder to drive it like I wanted it to perform. I did the same thing with my BMW motorcycle and my bike is faster than another friends bike - same exact model. I'm sold on the hard break-in.
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