Sunday 15th October 1978
The prototype 3-litre diesel Mercedes C111-3 attained 203.3 mph in tests on the Nardo Circuit Southern Italy. The car, with an air drag coefficient of .191, maintained an average speed of 195.4 mph over a 12 hour period, covering a record distance of 2344 miles and averaged 16.0 liters/100 km at 316 km/h (14.7 mpg at 195.4 mph). The C111-3 was powered by a 170 kW (230 hp) at 4,500 rpm straight-five OM617 turbocharged Diesel engine. A later 372 kW (500 hp) 4.8 L twin KKK-turbocharged V8 version set another record, with an average lap-speed of 403.78 km/h (250.958 mph). It was achieved by Hans Leibold in 1 minute, 56.67 seconds on May 5, 1979. Mercedes-Benz introduced the C112 at the Frankfurt Motor Show in 1991 as a proposed production sports car. The car used a mid-mounted 6.0 L V12 engine. After accepting 700 deposits, the company decided not to proceed with production.