Motorsport
For many years, 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 Grand Sport.
The golden age of Buick in motorsport, however, was the late eighties. General Motors entered the Regal, particularly the Grand National model, in the NASCAR Winston Cup Series alongside the Oldsmobile Cutlass. Buick was also a major powerplant in the CART 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 eighties and nineties using aftermarket V8 engines.
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