revved

Hi guys, my mother is looking for a new car, and she really likes mercs ☺ so I went with her to view a 2002 avantgarde c270 estate today and it was blowing blue smoke when revved. Not black or white just blue, when first started from cold it idled quite rough but settled down when warmed up...

Hi, just looking to buy a c250 turbo estate & found when revved it screeches as though the belt is slipping - but it sounds like it's coming from the turbo. Anyone had experience of this before? It's done a lot of miles (200k) but seems to have been looked after with most of the history...