I would say the major dilema is if you want a wagon or a sedan. If you want a wagon go for it. If not, keep yours and get the air put on.

If it were me, I'd go for the wagon.

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2009 ML320 Bluetec
1985 300CD
1981 300TD

Past Mercedes
1979 300TD
1982 300TD
2000 E320 4Matic Wagon
1998 E430
1984 300SD
1980 300SD