My unit is running just fine. Of course I do take care of it. I run Pirelli's on the front and Michelin's on the rear. I had new plugs installed at 55K, and the Mercedes dealer just did a 60K service of flushing coolant, flushing brakes, new fluid in transmission and rear differential. And thanks to whomever it was that mentioned strange things happen electrically if battery needs replacing. Strange things were happening but new battery took care of the problem.
Thanks for all the great information on this site.
most appreciate