Hey! Welcome back LeBenz!
Squeekes and Rattles are about the only problem we haven't had with our Chrysler('96 Cirrus). 109K miles, and it's still tight.
Might as well get used to the cross-platform thing. It's been getting more used all the time. We owned our Cirrus almost a year before I found out all it is a Mitsubishi Diamante with a different body on it. (Wasn't sure if that was a good thing or not at the time. It's not.)
"Lastly, can you have 39% of the repairs done at a Mercedes dealer?"
That 39% may be the only decent service you get