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but how can dealers say there's no break in period?
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Only actual "M" cars have a required break in period, to be brought in at 1200 miles for oil change, diff change, and have the map tweaked.
You still want to properly break in your car though. Drive it normal. Don't beat on it too hard, and try not to go over 4500rpm or 90mph for the first 1200 miles.