Mercedes-Benz introduced the 220 sedan at the April 1951 Frankfurt Auto Show with regular series production beginning in July of that year. The 220 was the successor to the 170 S and a clever update, using essentially the same body as its predecessor. The main design change faired the headlights into the leading edge of the front fenders with chrome trim atop them so as to have a streamlined effect. The most significant change was under the bonnet, whereby a new 2.2-litre, six-cylinder engine replaced the former four-cylinder engine used in the 170 S. Horsepower jumped from 52 to 80, making the car an able autobahn cruiser, just as Mercedes-Benz had intended. In addition, due to the extra power, the car was equipped with Duplex drum brakes.