A Mercedes-Benz 420 averages €90,386 across all model years. Right now 4 are listed for sale, with the cheapest sitting around €72,419 (typically older years) and the priciest around €102,245 (recent years). The median is €93,439. A good price for a Mercedes-Benz 420 is under €81,580; 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 €70,079 to €84,095 for this model, depending on year and condition.