audi r18 etron 2013 FIA World Endurance Championship (WEC) (3)audi r18 etron 2013 FIA World Endurance Championship (WEC) (4)audi r18 etron 2013 FIA World Endurance Championship (WEC) (5)audi r18 etron 2013 FIA World Endurance Championship (WEC) (6)audi r18 etron 2013 FIA World Endurance Championship (WEC) (1)