C class cars don't seem to have rust problems, just the W210 E's. The rust you describe sounds like someone hit it or the owner hit something, and was to cheap to fix it. Figure out what it will cost to fix and factor that into the price. If you want a MB you can't go wrong with a C.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200