Date registered: Mar 2006
Vehicle: 2007 SLK55 AMG
Location: South Texas
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RE: Any need to "break-in" the engine?
Not sure if it's the same for non-AMG cars, but AMG, in their owners manual, says to do the usual break-in for 1000 miles. (Keep it below 4000 RPM, no more than 2/3 throttle and vary your speed.) They say that the engine is already broken in at the factory, but the tranny and differential are what must be broken in.
It's interesting that all the controversy I've seen about how to best break in a new motor doesn't even mention the tranny and rear end. Hmm.