Mazda scored two firsts this weekend at the Brickyard: a first Indy win for the company and a first win for a diesel car at this legendary racetrack.

Over the past four decades, Mazda has scored hundreds of race wins at tracks across the country, and around the world.  But until yesterday, Mazda did not have a win at what is perhaps the most famous racetrack in the world, the Indianapolis Motor Speedway. That box has now been checked.

In the Grand-Am Brickyard Grand Prix, the #70 SpeedSource Castrol Edge Mazda6 SKYACTIV-D Clean Diesel scored the GX class win.

The win was the fifth in a row for the all-new diesel-powered Mazda6, and moves it ahead of Porsche after eight 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.

The Indy race also was the third and final round of the Grand-Am North America Endurance Championship, the first two rounds having been the Rolex 24 at Daytona and the Sahlen’s Six Hour at Watkins Glen.

The SpeedSource Mazda won the team championship for the GX class.

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 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.

Mazda said the SKYACTIV-D Clean Diesel engine in the all-new Mazda6 is a true production-based engine. The engine is 51 percent stock by parts count, and 63 percent stock by weight.