The Mercedes-Benz E350 CGI BlueEFFICIENCY was a diesel-powered variant of the A207 Cabriolet that debuted for the 2010 model year. The E350 CGI BlueEFFICIENCY cabriolet was originally powered by Mercedes' M272 DE35 engine, which was a 288hp naturally aspirated 3.5L V6. This engine was replaced during the 2012 model year by the M276 DE35, which was a new, more efficient V6 that had an output of 302hp. Both engines were paired to a 7-speed automatic transmission that sent power to the rear wheels. Production of the A207 Mercedes-Benz E350 CGI BlueEFFICIENCY lasted until 2017.