I would be careful of the bluetec diesels. A friend had one of the newer ones (a 2010 I think) and it left him stranded numerous times in the cold, and not for the usual, "hard-starting in the cold" diesel reasons. This happened in VA & WV, not exactly polar conditions.

He was back & forth to the dealer a bunch more times and eventually got fed up and sold it.

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Gil

2004 ML350
1984 300CD; Ivory (sold)