The successful racing career of the Mercedes GP racing car from 1914, powered by an innovative four-valve, four-cylinder engine that revved higher than all its competitors, lasted 16 years. Equipped only with rear brakes, the car won the French Grand Prix in 1914 thanks to its extra power, while the competition already had brakes on all wheels. The concept was so successful that victories were possible again and again over a period of around 15 years. This report will briefly go into some technical details, summarize the racing successes and show the car in many historical and current pictures.