Not trying to start anything, but how can you say that? He is looking for advice on what is recommended and his car is a 2006, which means it was more than likely produced in 2005, making it at least 7 years old. Clearly above, directly from the manual, it states 5 years for plugs. I understand there is some room to fudge, especially with low miles, but at least give the guy accurate info based on Mercedes engineers' data, not your opinion...