The Saab 900 is a front-engine, front-wheel-drive mid-size car with a longitudinally mounted, 45-degree canted, inline four-cylinder engine, double wishbone front suspension and beam-axle rear suspension. It was originally introduced on 12 May 1978, for the 1979 model year.[1] Sales commenced in the fall of 1978.

Like its predecessor the 99, the 900 contained a number of unusual design features that distinguish it from most other cars. First, the B-engine, that was installed "backwards", with power delivered from the crank at the front of the car. Second, the transmission, technically a transaxle, bolted directly to the bottom of the engine to form the oil pan (albeit with separate oil lubrication). Thus, power from the crank would be delivered out of the engine at the front, then transferred down and back to the transmission below, via a set of chain-driven primary gears. In similar fashion, Minis also had their gearbox mounted directly below the engine; however, the Mini gearbox and engine shared the same oil, whereas the Saab 900 (and 99) gearboxes contained a separate sump for engine oil.