The term 'OLD MITSUBISHI MODEL' can be summarized by the crossword solution 'DIAMANTE, ' which is an 8-letter word. The Mitsubishi Diamante was a mid-size luxury car that was produced by Mitsubishi Motors from 1990 to 2005. It was available as a sedan, station wagon, and a hardtop coupe. The Diamante was powered by a 3.0-liter V6 engine and featured a variety of luxury amenities, such as leather seating, power windows, and a sunroof.