Quote:
Originally Posted by reppucci
Mine was replaced at about 1000 miles under recall. Got my 1200 BI service done then.
The diff fluid needs to be replaced at 2200 miles( 1200 miles after new diff put in).
I still can't completely get on it to allow the new diff to "breakin".
I did however have car on the track just before the old diff was replaced.
There is some controversy on these forums about the M2 1200 mile breakin. Seems the M2 1200 mile breakin service is more for the M diff than for the engine. M235 doesn't have the same 1200 service IIRC! M3 and M4 do also but they may also undergo ECU reprogrammed to increase power and rev limit.
It is confirmed that the M2, aside from Launch control in DCT, has NO ECU power or rev limitations removed at the 1200 mile BI service
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Well not quite...the motor itself is broken in from WOT testing at factory, HOWEVER, the M diff and the remainder of the drivetrain components do have to be broken in.
But as you said, the M diff if by far the most important part of that puzzle.