 Complete the following phrase:  Penske entered the Formula One World Championship from 1974 to 1976. Although the cars were built at the British base in Poole, the team held an American licence. In 1971, Penske had sponsored the second McLaren entry in the 1971 Canadian and US GP, entering Mark Donohue, who took the car to a podium finish. The team returned three years later, in the 1974 Canadian GP, with their own chassis, the PC1, a standard tub built around a Cosworth DFV engine and a Hewland gearbox. Donohue took the car to 12th place on its debut. In 1975, Roger Penske mounted a full season attack with the PC1, Donohue managing to score a fifth place in the Swedish GP. However, the car was retired after the French GP and Penske entered a March 751 for the next three races, scoring another fifth in the British GP. However, Donohue crashed the car in the final practice session of the 