Oldsmobile Omega: Which Version Should You Buy?
Choosing an Oldsmobile Omega from the catalogue data comes down to two very different formulas. The 1975–1979 generation is a Sedan with two Gasoline, Automatic, RWD versions: 4.1 AT and 5.0 AT.
Choosing an Oldsmobile Omega from the catalogue data comes down to two very different formulas. The 1975–1979 generation is a Sedan with two Gasoline, Automatic, RWD versions: 4.1 AT and 5.0 AT. The 1980–1984 generation is also a Sedan, but its six listed versions use FWD and offer Manual or Automatic gearboxes, with either a 2.5-litre Inline four-cylinder engine or a 2.8-litre V-shaped six-cylinder engine. For buyers who prioritize measured performance, the 1980–1984 2.8 MT with 112 hp provides the strongest documented result: 0–100 km/h in 10.9 seconds and a top speed of 175 km/h. The 135 hp versions offer the highest stated output, but their acceleration and top-speed figures are not measured.
Oldsmobile Omega generations: what changed?
The 1975–1979 Oldsmobile Omega generation contains two versions, both with a Sedan body. The 4.1 AT has a 4,090 cm³ Gasoline engine with 6 cylinders in an Inline layout, while the 5.0 AT has a 5,001 cm³ Gasoline engine with 8 cylinders in a V-shaped layout. Both engines are mounted Front, longitudinal and paired with Automatic transmission and RWD. Power, torque and gearbox gear counts are not measured, so the available data cannot establish which of these versions is faster or more powerful.
The 1980–1984 Oldsmobile Omega generation contains six versions and retains the Sedan body while changing the mechanical specification to FWD. Buyers can choose a 2.5 MT or 2.5 AT with a 2,471 cm³ Inline four-cylinder engine, or a 2.8 MT or 2.8 AT with a 2,835 cm³ V-shaped six-cylinder engine. The 2.8 versions appear with either 112 hp or 135 hp, so identical version names must be distinguished by output. Manual versions have 4 gears, while Automatic versions have 3 gears.
Oldsmobile Omega engine options and specs
| Generation | Version | Power | Torque | Displacement | Fuel | Cylinders | Layout | Boost | Gearbox | Drive |
|---|---|---|---|---|---|---|---|---|---|---|
| 1975–1979 | 5.0 AT | not measured | not measured | 5,001 cm³ | Gasoline | 8 | V-shaped | not measured | Automatic, gears not measured | RWD |
| 1975–1979 | 4.1 AT | not measured | not measured | 4,090 cm³ | Gasoline | 6 | Inline | not measured | Automatic, gears not measured | RWD |
| 1980–1984 | 2.5 MT | 91 hp / 67 kW | 182 Nm | 2,471 cm³ | Gasoline | 4 | Inline | No | Manual, 4 gears | FWD |
| 1980–1984 | 2.5 AT | 91 hp / 67 kW | 182 Nm | 2,471 cm³ | Gasoline | 4 | Inline | No | Automatic, 3 gears | FWD |
| 1980–1984 | 2.8 MT (112 hp) | 112 hp / 82 kW | 197 Nm | 2,835 cm³ | Gasoline | 6 | V-shaped | No | Manual, 4 gears | FWD |
| 1980–1984 | 2.8 AT (112 hp) | 112 hp / 82 kW | 197 Nm | 2,835 cm³ | Gasoline | 6 | V-shaped | No | Automatic, 3 gears | FWD |
| 1980–1984 | 2.8 MT (135 hp) | 135 hp / 99 kW | 197 Nm | 2,835 cm³ | Gasoline | 6 | V-shaped | No | Manual, 4 gears | FWD |
| 1980–1984 | 2.8 AT (135 hp) | 135 hp / 99 kW | 197 Nm | 2,835 cm³ | Gasoline | 6 | V-shaped | No | Automatic, 3 gears | FWD |
Within the 1980–1984 generation, moving from either 2.5 version to a 112 hp 2.8 version adds 21 hp, 15 Nm and 364 cm³. The 112 hp 2.8 engine produces approximately 39.5 hp per litre, compared with approximately 36.8 hp per litre for the 91 hp 2.5 engine.
The 135 hp 2.8 versions add 23 hp over the 112 hp 2.8 versions while displacement remains 2,835 cm³ and stated torque remains 197 Nm. Their specific output is approximately 47.6 hp per litre, about 8.1 hp per litre higher than that of the 112 hp 2.8. This makes the 135 hp specification the strongest choice by stated power density, although the data does not show whether that advantage produces better measured acceleration.
Fuel delivery also separates the engines. The 1980–1984 2.5 MT and 2.5 AT use Central injection (single-point or single- point), whereas all four 2.8 versions use Carburetor. The fuel systems of the 1975–1979 4.1 AT and 5.0 AT are not measured.
Performance, acceleration and mpg
| Generation | Version | 0–100 km/h | Top speed | City consumption | Highway consumption | Combined consumption |
|---|---|---|---|---|---|---|
| 1975–1979 | 5.0 AT | not measured | not measured | not measured | not measured | not measured |
| 1975–1979 | 4.1 AT | not measured | not measured | not measured | not measured | not measured |
| 1980–1984 | 2.5 MT | 13.1 s | 165 km/h | not measured | not measured | not measured |
| 1980–1984 | 2.5 AT | 15.5 s | 158 km/h | not measured | not measured | not measured |
| 1980–1984 | 2.8 MT (112 hp) | 10.9 s | 175 km/h | not measured | not measured | not measured |
| 1980–1984 | 2.8 AT (112 hp) | 12.5 s | 173 km/h | not measured | not measured | not measured |
| 1980–1984 | 2.8 MT (135 hp) | not measured | not measured | not measured | not measured | not measured |
| 1980–1984 | 2.8 AT (135 hp) | not measured | not measured | not measured | not measured | not measured |
The transmission comparison is clearest in the 91 hp 2.5 pair. The 2.5 MT reaches 100 km/h 2.4 seconds sooner than the 2.5 AT and has a top speed 7 km/h higher. Both have the same 2,471 cm³ engine, 91 hp and 182 Nm, making the Manual gearbox the stronger documented performance choice.
The same pattern appears in the 112 hp 2.8 pair. The 2.8 MT reaches 100 km/h 1.6 seconds sooner than the 2.8 AT, while its top speed is 2 km/h higher. Compared with the 2.5 MT, the 112 hp 2.8 MT is 2.2 seconds quicker to 100 km/h and 10 km/h faster at the top end. Compared with the 2.5 AT, the 112 hp 2.8 AT is 3.0 seconds quicker and 15 km/h faster.
No city, highway or combined fuel-consumption figure is measured for any listed Oldsmobile Omega version. An mpg comparison therefore cannot be made from the available data. The 1975–1979 versions specify fuel as 92, while the fuel grade for every 1980–1984 version is not measured.
Oldsmobile Omega dimensions, weight and practical specs
| Generation | Version | Kerb weight | Gross weight | Ground clearance | Tank | Wheel sizes |
|---|---|---|---|---|---|---|
| 1975–1979 | 5.0 AT | not measured | not measured | not measured | not measured | not measured |
| 1975–1979 | 4.1 AT | not measured | not measured | not measured | not measured | not measured |
| 1980–1984 | 2.5 MT | not measured | not measured | 193 mm | not measured | not measured |
| 1980–1984 | 2.5 AT | not measured | not measured | 193 mm | not measured | not measured |
| 1980–1984 | 2.8 MT (112 hp) | not measured | not measured | 193 mm | not measured | not measured |
| 1980–1984 | 2.8 AT (112 hp) | not measured | not measured | 193 mm | not measured | not measured |
| 1980–1984 | 2.8 MT (135 hp) | not measured | not measured | 193 mm | not measured | not measured |
| 1980–1984 | 2.8 AT (135 hp) | not measured | not measured | 193 mm | not measured | not measured |
Kerb weight and gross weight are not measured for any version, so weight per horsepower cannot be calculated. Tank capacity and wheel sizes are also not measured throughout the range. Ground clearance is measured only for the 1980–1984 generation, where every version has 193 mm.
All listed versions use Independent, spring front suspension and Dependent, spring rear suspension. Every version also combines Disc front brakes with Drum rear brakes, so these items do not provide a basis for choosing between engines or transmissions.
Oldsmobile Omega reliability and problems
Reliability, maintenance history and known-problem data are not measured for any version. The specifications therefore cannot support a claim that the 4.1 AT, 5.0 AT, 2.5 MT, 2.5 AT, either 2.8 MT, or either 2.8 AT is more reliable. A buying decision based on problems or durability requires information beyond this catalogue dataset.
Which Oldsmobile Omega version should you buy?
For the best fully measured performance, choose the 1980–1984 2.8 MT with 112 hp. Its 10.9-second 0–100 km/h result and 175 km/h top speed are the best measured figures in the data, and it improves on the 2.5 MT by 21 hp and 15 Nm.
For an Automatic with measured performance, the 1980–1984 2.8 AT with 112 hp is the strongest documented choice. It reaches 100 km/h in 12.5 seconds and has a 173 km/h top speed, outperforming the 2.5 AT by 3.0 seconds and 15 km/h.
For maximum stated output, choose the 1980–1984 2.8 MT or 2.8 AT with 135 hp. Each delivers 23 hp more than its 112 hp counterpart from the same 2,835 cm³ displacement, but neither has measured acceleration or top speed. The Manual version offers 4 gears, while the Automatic has 3.
Choose the 2.5 MT over the 2.5 AT when documented performance matters: their power and torque are identical, but the 2.5 MT is quicker to 100 km/h and has the higher top speed. Choose the 1975–1979 4.1 AT or 5.0 AT only when the earlier generation’s Automatic, RWD configuration is the priority. Between those two, displacement and engine layout are known, but power, torque, acceleration and top speed are not measured, so the data does not justify naming either one the better performer.