A Mercedes-Benz 420 averages €92,323 across all model years. Right now 3 are listed for sale, with the cheapest sitting around €72,479 (typically older years) and the priciest around €102,245 (recent years). The median is €102,245. A good price for a Mercedes-Benz 420 is under €87,362; anything over €102,245 is on the high side compared with similar listings. Selling to a dealer instead of privately usually means a lower price: expect roughly €76,684 to €92,020 for this model, depending on year and condition.