The O'Reilly Challenge is a NASCAR Busch Series race that takes place at Texas Motor Speedway. This race's origins came about by the Ferko lawsuit in 2004. With Darlington Raceway dropping its traditional Labor Day weekend, TMS gained a Nextel Cup and Busch Series race.

Kevin Harvick is the only driver to have ever won this race winning both the 2005-2006 races.

Texas Motor Speedway is a superspeedway located in the northernmost portion of the U.S. city of Fort Worth, Texas -- the portion located in Denton County, Texas. (The mailing address lists nearby Justin, Texas, the nearest post office, but the track itself is in Fort Worth -- signage on the Turn 1 and 3 walls reads "Fort Worth -- Denton County".) The track layout is very similar to Atlanta Motor Speedway and Lowe's Motor Speedway (formerly Charlotte Motor Speedway). The track measures 1.5 miles around and is banked 24 degrees in the turns, and is of the quad-oval design, where the front straghtaway juts outward slightly. The track is owned by Speedway Motorsports, Inc., the same company that owns Atlanta and Lowe's Motor Speedways, as well as the short-track Bristol Motor Speedway.

Based on qualifying speeds in 2004, 2005, and 2006 (with Brian Vickers shattering the qualifying record at Texas with a speed of 196.235 mph in the 2006 Dickies 500 qualifying), the Texas Motor Speedway was once considered the fastest non-restrictor plate track on the NASCAR circuit, with qualifying speeds in excess of 192 mph and corner entry speeds over 200 mph. However, as the tracks' respective racing surfaces continue to wear, qualifying speeds at Atlanta have become consistently faster than at Texas (2005 and 2006). Brian Vickers holds the qualifying record at TMS. In 2006, he posted a 196.235 mph speed. Elliott Sadler beat the record before Brian, qualifying in the 49/50th spot. Being the last person out on the track, Brian nipped Elliott Sadler's qualifying time.