The 2013 Royal Purple 300 was the fifth stock car race of the 2013 NASCAR Nationwide Series and the 17th iteration of the event. The race was held on Saturday, March 23, 2013, in Fontana, California, at Auto Club Speedway, a 2 miles (3.2 km) permanent D-shaped oval racetrack. The race took the scheduled 150 laps to complete. At race's end, Joe Gibbs Racing driver Kyle Busch would dominate the race to win his 54th career NASCAR Nationwide Series win and his third of the season. To fill out the podium, Sam Hornish Jr. of Penske Racing and Regan Smith of JR Motorsports would finish second and third, respectively.