Hi all, First time poster, but found this forum thoroughly useful in the past. Thanks for all your help! I have owned my first Mercedes for a couple of months now and naturally im in love with it already. Just a niggle though- the idle is not perfectly smooth. It only jumps around about 20rmp each way, but my only experience driving diesels is double decker busses. Probably not a fair comparison! Is this normal for these cars, or should I look into the dreaded injector replacement? The car is a W204 C Class 2013 60k miles, and I got the impression that the injector problems had been ironed out. It has a full MB service history and seems very well looked after! If I'm being paranoid I apologise. I couldnt find anything on the forum about what constitutes a rough idle, and the car is otherwise perfect with good power delivery! Thanks.