I purchased my 2012 ML350 Bluetec back in November 2011.
After 2 weeks, the first problem I had was car was pulling to the right at highway speed.
After left it with the dealer for about a week, they finally realized that it was bad tire which took them a few more days to get replacement.
Next, I was having problem with car loosing power when driving over a long distance or for a few hours.
There is no error message on the dashboard nor that the dealer can replicate.
Anyway, I start documenting them on video using my phone.
They finally acknowledge but still no solution for it.
Along with the car loosing power, I was getting error with PRE-SAFE Inoperative error and Ad-Blue low level
Great long commuter
Great audio system
Great gas mileage for a truck