Stommelen led the race to the first pitstops, leading a train of five Porsches (Stommelen, Elford, Siffert, Mitter, Herrmann). Bonnier's Lola was sixth, but then Stommelen was delayed by oil leaking from the transmission. Gardner brought the Alan Mann Ford in several times with overheating because debris from the accident had holed the radiator. Jo Siffert and Brian Redman took over the lead until they too were crippled by an oil-leak in the gearbox after four hours. This moved the Elford/Attwood 917 to the lead, ahead of the other 908 team cars of Mitter/Schütz, Herrmann/Larrousse and Lins/Kauhsen, pursued by the Matra of Beltoise/Courage then the Wyer Ford of Ickx/Oliver in 6th. In the sixth hour a number of cars had problems: Herrmann was delayed for 20 minutes repairing the front suspension with parts from Siffert's car (dropping to 12th), and the Matra lost two laps fixing a faulty rear light. The leading Alpine of de Cortanze/Vinatier (running 11th) lost a wheel at Indianapolis corner. With a large crowd of observers he 'fortuitously' found the right tools on the grass verge but dropped well back. The Matra was being raced very hard and by dusk, at 9pm, had made it up to second only to be delayed repeatedly by slow pitwork.