In march of this year, M-B released a bulletin, advising a one-time-only transmission fluid change @ 40 k miles.
This is to remove any particles that may have accumulated during break-in.
At the same time it is also advised to change the fluid on the 4-matic transfer case?
If anybody would like to read the bulletin ( it's all in german ), here it is:
http://www.motor-talk.de/t866242/f151/s/thread.html

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2007 C 230 Sport.