I was crying into my beer as 2 Mercedes specialists had diagnosed a juddering drive at low throttle and medium revs to be the lunched gearbox and torque convertor due to the contamination issue. I had also thought the same after reading many threads on it. Both garages drove the car and put it onto Star. The second garage had agreed to give the car the once over so as I could see whether it was worth spending the £2k plus required to sort the problem out properly. They went into all the fault codes and erased them (no current ones, just stored ones), and because the rest of the car is good I decided I would take the plunge and spend the money. As soon as I drove away from the garage, it became obvious that the car was different, a few more miles and it hadn't juddered or done anything naughty. So now I'm wondering what they have done, after a 50 mile exploratory trip the car doesn't judder anymore, a phone call to them had them stumped too. Now, I'm expecting the problem to reappear as soon as I drive it next because surely this can't be right. Can anyone shed any light on this seemingly miraculous pause/cure to this problem?