Bought my ML350 new in 2006. Replaced cam plugs at 60K, Replaced every coil at various miles, Replaced intake at 80K, replaced The Balance Shaft at 100K. And that was just the engine., The other big job was sending out the 722.9 trans electronic conductor plate to have the solder re-flowed because of the bad speed sensor problem.
It is a good thing I Love working on cars!
......And I will never buy a new car again! I have no problems with all the used cars I have purchased . Just minor stuff nothing like the Ml350 M272.