A lighter duty range called the M-series was added in mid-1984, replacing the long defunct Fiat 130NC.

[1] It was originally sold with either Fiat or OM badging, with a number indicating the gross tonnage (170-190).

The truck was offered with two engine options, six cylinder and V8 diesels, with a peak performance of 330 hp (243 kW).

These light duty trucks were powered by in line six engines capable of producing 210 hp (154 kW), available in four different wheelbase options and also tractive unit.

Smaller trucks, up to the 145, had their headlights mounted in the grille, while larger models had them in the bumper (165 and up).