The Mercedes-Benz 170 S is a luxury car which was produced by Mercedes-Benz from 1949 until 1955 in various gasoline and diesel powered forms. It was initially offered with a 1.8 liter version of the 1.7 liter inline-four cylinder M136 engine used in the slightly smaller production type 170 V. It was the first Mercedes-Benz to carry in its name the suffix “S” (for Sonder modell (Special model) denoting a superior level of comfort and quality. As such, its intended market was successful business owners and company directors.