The extremely rare (12 total built) Mercedes-Benz M950F was a normally aspirated Wankel engine mounted in experimental Mercedes-Benz C111 vehicles, built in 1969-70. There were two versions: 3-rotor engine (600 cc or 37 cu in each) with power output of 280 hp (210 kW) at 7000 rpm, and a later version 4-rotor engine (600 cc or 37 cu in each) with power output of 350 hp (260 kW) at 7000 rpm.
The experimental Mercedes-Benz C111 containing the (code named M950F) engine was shown to the public at the 1969 Frankfurt International Motor Show.
This was a totally experimental car from Daimler-Benz. The company dropped Wankel rotary development mainly due to poor fuel consumption in this engine, an unacceptable feature in the post-1973 oil crisis world. It was replaced by a turbocharged diesel piston engine.