The Monster Energy NASCAR Cup Series races on to Texas Motor Speedway Sunday, March 31 at 3 p.m. ET. In the 2019 O'Reilly Auto Parts 500, race cars will use the same low-horsepower package as Las Vegas and Fontana. Drafting will come into play due to the lower speeds and the aero ducts. Texas also added a traction compound in the corners of the racetrack to create another racing lane.