Mazda was not the first diesel-powered racer to battle at the Indianapolis Motor Speedway, but it became the first to see the checkered flag at the famed Brickyard when it won its class at the Grand-Am Brickyard Grand Prix. The No. 70 SpeedSource Castrol Edge Mazda6 SKYACTIV-D Clean Diesel did the honors, scoring the GX class win.
The win was the fifth in a row for the all-new Mazda6 and moves it ahead of Porsche after 8 of 12 races in the GX manufacturers championship race. As has been the case all year long, it was a three-car battle between Mazda and Porsche, with both brands leading at times. Eventual winner Sylvain Tremblay took the lead with 47 laps remaining in the three-hour race, and was never headed.
This was only the second year that sports cars have been a featured race at the track most noted for the famed Indianapolis 500. The track has had a wide variety of powertrain configurations and technologies compete, but never before had a diesel engine won at Indy. The most recent diesel to compete was the Cummins Engine Special, which won the pole for the Indy 500 in 1952, but a clogged turbo prematurely ended its race.