Which used Mercedes M Class 4x4 should I buy?
For now, just about the only place you'll find a used example of this version of the M-Class is a Mercedes dealer or through a Mercedes Direct outlet.
However, wherever you look, go for a diesel-powered model, which has the advantages of better fuel economy and stronger low-down pull. The ML320 CDI, in particular, is a gem, with a good blend of performance and economy. By comparison, the ML280 CDI feels a little weak, and the ML420 CDI is just too expensive.