1978 Ninety-Eight

Whats new for '78:
With such a major redesign the previous year, changes for '78 are minimal. The major change is the addition of a diesel V8 to the options list. A rallye instrument cluster is also a new option. Visually, there is a new grille design and wraparound turn lenses. In the rear, tail lamps are new too.
Biggest News:
The newly optional Diesel 350 is the first diesel V8 in the world. It was originally scheduled to be introduced in '77, but production delays prohibited that. Tests revealed a fuel economy gain of up to 25 percent with the diesel engine over comparable gasoline powered engines.

78 Oldsmobile Ninety-Eight
Powertrain Specs
Standard Engine350 V8 4bbl.
Optional Engine(s)403 V8 4bbbl.
350 Diesel V8
Standard Transmission

3-speed Turbo Hydra-matic
Optional Transmission(s)

Exterior DimensionsCoupe/Sedan
Overall length (in.)220.4
Wheelbase (in.)119.0
Luggage cap. (cu. ft.)

Fuel tank (gals.)

Interior DimensionsCoupeSedan
Headroom f/rna39.3/38.0
Legroom f/rna42.2/40.9
Shoulder room f/r

Identifying a '78:
'77-'79 Ninety-Eight's all share the same overall shape. A '78 will have wraparound front turn-lenses like in '79, but front parking lights are segmented in two like in '77.

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