It competed three times at both Le Mans and the 24 Hours of Daytona race before retiring in 1970. The car then spent the next 55 years at the Indianapolis Motor Speedway Museum in the US.

Hybrid technology slipped into Le Mans racing without ... sidelines Audi’s cars would be drowned out by everything else on the circuit. Not that Audi had dropped in any old 2-litre TDI, nor ...