The Custom Cruiser Series 98 was the top of the line Oldsmobile for 1946. Just three models were offered and all powered by the "Fire-Power" straight eight engine. Most equipment found standard on the 60 and 70 series cars was also standard on the 90 models. Other standard equipment included: wraparound bumpers, DeLuxe instrument cluster, clock, rear seat arm rest and foam rubber seat cushions. Available upholstery spanned either leather, broadcloth or Bedford cord. Tire size was 7.00 x 15 inches.

Three-speed manual with column shifter was standard.
Fully automatic HydraMatic transmission was optional.

Convenience Options were -
Condition-Air heater and ventilating system - Dual-flow heater and defroster - DeLuxe radio - Standard radio - DeLuxe plastic steering wheel - Electric clock - Directional signals - Safety spotlight - Auxiliary driving lights