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      06-29-2007, 11:59 AM   #8
Drives: 06 M5
Join Date: Jun 2007
Location: San Francisco

Posts: 70
iTrader: (0)

Totally agree with 888... M motors, and trannys, are very tight at first and they really need to be given time to break-in. Remember that the "break-in" period is not just for the Motor, its for the whole car.

Not sure about the E90, but on the E46 M3 and E60 M5, the ECU actually records the number of times you go over recommended break-in rpm, at two threasholds (med and high) and the number of times you hit the rev-limiter. Improper break-in could result in warranty hassles down the line.
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