this is no problem with tensioner , problem is with balancing shaft , tooth are made from very weak metal and after 100 ,000 km tooth totaly destroyed , so engine need new balancing shaft , tensioners , chain , and engine need be remowe from the car , this is very expensive and this is sabotage of mercedes , customers suffer big expenses , this is not fair , engines should be replaced by mercedes , and mercedes should pay for it .
i have an replaced idler and now that engine has gone up to 300 000 km im starting having an issue of tensioner meaby as my left camshafts are slightly jumping 0,5 degrees from left to right so i have weird issue going on now.