Just a little FYI for everyone here. I have just returned from the Philly auto show. I went with the MBCA, we got in for free and 1 hour early. Anyways, the MBUSA representive said that diesels will be returning. However, first they have to get the engines to pass all 50 states standards. I only overheard him talking about it. He did say that there are about 4 or 5 states so far. Recently Mass. was added as a state that would accept the new MB diesels.
What I don't understand is, how can VW sell diesel engines in the Jetta, Golf, and the Beetle, yet MB can't sell even one model.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member