The Mitsubishi Saturn or 4G3 engine is series of overhead camshaft (OHC) straight-four internal combustion engines introduced by Mitsubishi Motors and saw first service in the 1969 Colt Galant. Displacement ranges from 1.2 to 1.8 L, although there was also a rare 2-litre (1,994 cc) inline-six version built from 1970 until 1976. The early versions have chain driven valvetrain while the later versions are belt driven and equipped with balance shafts.

The Mitsubishi Debonair is a four-door executive sedan introduced by Mitsubishi Motors in 1964 to serve as their flagship passenger vehicle in the Japanese market. The word "debonair" means gentle, courteous, suave, lighthearted, or nonchalant.