Buick

Buick was a substitute for Chevrolet in automobile racing. No earlier than the 1960s, Buick was a competitor in the Indianapolis 500, and (like almost every other American manufacturer) also participated in the Grand National stock car racing series using its Regal and later the Gran Sport.

The golden age of Buick in motorsport, however, was the early to late 1980s. General Motors entered the Regal, particularly the Grand National model, in the NASCAR Cup Series alongside the Oldsmobile Cutlass. Buick was also a major powerplant in the IndyCar Series and IMSA GT Series (particularly in the IMSA GTP class) for several years. The 1990s, however, proved to be the end of Buick's reign in motorsports, as GM replaced it for many years with Oldsmobile before phasing out that marque in 2004. Oldsmobile would be replaced by Pontiac until its demise in 2009, being replaced by Chevrolet.

Buicks were also entered in the Trans Am Series in the 1980s and 1990s using aftermarket V8 engines.