Suburban Propane 300 NASCAR O'Reilly Auto Parts Series is a night of high-speed stock car racing at Bristol Motor Speedway in Bristol, Tennessee. Bristol is one of NASCAR's most famous tracks, known for its steep banked turns, tight pack racing and roaring crowds that make the place feel like a stadium. Racing under the lights is a classic Southern experience, and the O'Reilly Auto Parts Series brings plenty of drama on the track.