After a long hiatus, the M nameplate was used for Infiniti's mid-luxury sedans (executive cars). First was the short-lived M45 sedan, a rebadged version of the Japanese-spec Nissan Gloria . The next generations, the M35/45 and M37/56/35h/30d, became the flagship of the Infiniti brand and are based on the JDM Nissan Fuga .

The Infiniti M30 was a 2-door coupe based on the Japanese market Nissan Leopard (chassis code F31). It was launched alongside the flagship Q45 in 1989 for the 1990 model year, and was intended as a stopgap until the later introduction of the G20 and J30 sedans.

The Infiniti M30 was powered by a 3-liter V6 and 4-speed automatic transmission. Standard equipment included a driver's airbag, anti-lock brakes, an anti-theft security system, Sonar Suspension II, and leather upholstery. Other standard equipment included a Bose audio system, automatic climate control, cruise control, a power moonroof, power windows, power locks, and power mirrors. Infiniti emphasized comfort and luxury, as well as simplicity - though dealerships officially offered a cellular phone and in-dash CD player, the M30 had no factory options.