The clearest performance divide is the engine: the 200's five-main-bearing M121 four (about 95 hp) is dependable but modest, while the 230's M180 straight-six with larger Zenith carburetors is praised as strong, drama-free and 'pulled like a train.' Owners describe the six-cylinder 230 as a meaningful step up from the four-cylinder and diesel cars.
Engine range: four-cylinder 190/200 versus the 230 straight-six
Mercedes-Benz 190/200/230 Fintail (W110) · mechanical