Buicks first sport utility vehicle, the Rainier was built on the same platform as the Chevrolet TrailBlazer. Ultimately a replacement of the Bravada sold by General Motors defunct Oldsmobile brand, the Buick Rainier debuted in 2004 as a luxury sport utility. With a rear-wheel and all-wheel drivetrain available, a 4.2-liter inline-six and a 5.3-liter V-8 engine propelled the premium-grade sport utility vehicle. Although a sport utility vehicle, the 2004 Buick Rainier was significantly the first Buick product to offer a V-8 engine since the 1996 Roadmaster. An electronically controlled rear air suspension was also included on the Rainier in order to provide a premium quality ride. The interior of the Rainier utilized QuietTuning for minimizing unwanted noise and vibrations while traveling. Configured only for five-passenger riding, the Buick sport utility vehicle offered a maximum interior cargo space of 80.1 cubic feet. Initially producing 290 horsepower, the V-8 powered Rainier received 300 horsepower for the 2005 model year. The 2005 model of the premium sport utility vehicle also added a standard occupant sensing system for the right-front passenger and an available touch-screen enabled navigation radio system. StabiliTrak electronic stability control was included standard on all models of the 2006 Buick Rainier. The 2006 Rainier received minor exterior enhancements through a standard chrome package and a revised front grille. Ending production following the 2007 model year, the Buick Rainier sport utility vehicle was abandoned in favor of the Enclave crossover vehicle.