A Mercedes-Benz 420 averages €79,907 across all model years. Right now 5 are listed for sale, with the cheapest sitting around €64,070 (typically older years) and the priciest around €102,245 (recent years). The median is €76,109. A good price for a Mercedes-Benz 420 is under €72,479; anything over €84,633 is on the high side compared with similar listings. Selling to a dealer instead of privately usually means a lower price: expect roughly €57,082 to €68,498 for this model, depending on year and condition.