What year is the C? If it is same age range (94-95 for the C) both cars have essentially the same major problems (wiring harnesses, head gaskets). Both will basically be the same price to operate (fuel, maintenance, etc.). The big deciding factor should be maintenance records. A well maintained car with 190k would be a better purchase than a poorly maintained with 140k. Get a thorough pre-purchase inspection by someone who knows MB before buying either one. There is nothing more expensive than a cheap Mercedes. Spending a little more to get quality and verifiable records will save you money before you know it.

Have you driven both to see which one you prefer?

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Jonathan

2011 Mazda2
2000 E320 4Matic Wagon
1994 C280 (retired)