I've heard about the complaints of owners of Mercedes ML320. I haven't owned one but just got interested in that issue coz every article I read says negative things about that model. But there's this new version, a 2007 ML320 CDI that has, I think, enhanced Mercedes ML320 parts.
Says on a review:

http://www.activelifestylevehicle.co...y_id=186&cat=3

That its fuel efficient and some other advantages with it. Just hopeful that the faulty parts on the previous version has been improved.