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      12-18-2009, 03:57 PM   #37
Kyoshi71's Avatar

Drives: 2010 M3 Coupe
Join Date: Jul 2006
Location: New York

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Originally Posted by turb934 View Post
Was told by M division engineers that a 1200 mile break in for the rear differentail & manual transmission is more critical than for the engine and then a fluid change.
M division engineers called you in Ontario to discuss trannies and diffs? Ok, I'll play along. I could only imagine that the reasoning would be that IF there were a problem, damage would be minimal ($$) and easily repaired as opposed to damage that takes place under full throttle. By no means though, do gears have a break-in period.