There is DIY article here for a W210. I followed it for my W124 M111.960 and everything was ok.

It's easier than it seems, just take enough time to think what needs taking off etc for you to access the necessary bolts.

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Smoke Silver 1994 E220 Coupe Automatic
0 kilometers 6 September 1994
100,635 kilometers - 6 September 2010