In part because my car is lowered with Eibach springs and Bilstein HD shocks. I do not want to deal with their lecture about non MB parts being on the car, and having to explain to them that it is close to the same set up the european avantgarde cars have.... I just have never found the dealer to be more honest or more competent than a good Mercedes Indy.

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2008 S550
2010 GLK350
1997 E420 (retired)
2005 CLK500 (retired)