I have both cars. They are apples and oranges to compare. The Jetta has a lot of pep, the M-B has class. The Jetta gets 50 MPG, but I don't think it's going to be as reliable as the Merc. It has already had an injection pump replaced at 16,000 miles under warranty. If that had gone and it wasn't covered, I would have been looking at a $3500 bill. Yippee. Parts are relatively cheap for the M-B. The A/C works well in the Jetta and the stereo rocks. Good points to each car.

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83 M-B 300D- daily driver
83 240D gray market
2002 VW Jetta TDI- beater