This page combines information on both the Mercedes-Benz W120 180 and W121 190 sedansThe Mercedes-Benz W120 was an inline-four cylinder sedan introduced by Mercedes-Benz in 1953. Powered initially by the company's existing 1.8 liter M136 engine, it was sold as the model 180 through 1962. The Mercedes-Benz W121 was introduced in 1956, powered by a 1.9 liter M121 engine.