When General Motors released the GMC S15 during 1981 as the 1982 model it represented a major advance in small truck production that resulted from the 1973 Arab oil embargo. The GMC S15 entered the market in 1982 with its 1.9L Isuzu four-cylinder engine but later received a major upgrade with its 4.3-liter V6 engine addition in 1988. All GMC S15 versions included standard or extended cab variants and short and long bed configurations while keeping their height at 61.3 inches and width at 64.8 inches. The available transmission options featured a basic five-speed manual and an extra cost four-speed automatic transmission to improve flexibility in driving conditions. GMC S15 provided an adjustable configuration between two-wheel and four-wheel drive systems while Insta-Trac 4WD as well as the hydraulic clutch system joined the lineup in following years. Fuel economy for the GMC S15 ranged from approximately 15 to 21 mpg in city driving and 19 to 25 mpg on the highway, depending on the engine and drivetrain configuration. Genuine GMC S15 parts provide the optimal choice because they follow original design criteria and pass strict quality tests which preserves the long-term value of the vehicle.