Audi is setting its sights on the next Le Mans victory with the new R18 TDI. The hardtop coupé was especially designed for the 24 hours at Le Mans. In 2011 rules call for much smaller engines than before. Audi decided upon a 3.7 liter V6 TDI engine to power the R18, continuing to place its faith in diesel power, with which it was successful for the first time back in 2006.