Good day. An acquaintance sells his Mercedes W211 3.0 diesel, station wagon of 2007, good condition. I don't know, I'm very hesitant, a lot of negative reviews about OM 642 engines say that it's better to buy a Mercedes 211 before 2006 with an OM 648 DE 32 LA (320 CDI) engine. What is your opinion on this. Thank you.