Since our car is a mesh of previous gen MB cars (SLK, etc.), I went to MBWorld and did a search. Looks like we may not be alone with this issue, though most of the threads are older:

http://www.mbworld.org/forums/showth...st#post2309472

http://www.mbworld.org/forums/showth...ust#post760781

http://www.mbworld.org/forums/showth...ust#post388514

This is a bad, bad thing. Think of all the unsuspecting Crossfire owners out there with rust eating up their doors. Grrrr.