Donīt worry about the engines. All, either 4 or 6 cylinders are good.
The best offer they can make you, would be a "Mille Miglia" edition. Itīs the nicest R170 theyīve ever build in my view. Just 52 left Mercedes Benz and the decision of the color was very simple: silver

. The choice of the engine was much harder: a 230 or a 320. It was build in 2002. If you get one of those, donīt wait.