Opel Vectra OPC

Opel Vectra OPC: which version to buy

If you are choosing an Opel Vectra OPC rather than reading a history of the nameplate, the decision sits inside one production window: 2005–2008, one generation in this catalogue (3 generation, restyling), one body (Estate 5-door), and 6 versions. All six use the same 2792 cm³ turbocharged Gasoline V-shaped 6-cylinder engine, FWD, and a 6-speed gearbox.

If you are choosing an Opel Vectra OPC rather than reading a history of the nameplate, the decision sits inside one production window: 2005–2008, one generation in this catalogue (3 generation, restyling), one body (Estate 5-door), and 6 versions. All six use the same 2792 cm³ turbocharged Gasoline V-shaped 6-cylinder engine, FWD, and a 6-speed gearbox. The buy question is therefore not “which engine family?” but which combination of 255 hp versus 280 hp, Manual versus Automatic, kerb mass, tank size, and 0–100 time you actually need.

There is no second generation in the data to “step up to.” The arithmetic below is the whole comparison.

Generations: what changed (and what did not)

3 generation, restyling (2005–2008). One body, Estate 5-door, 6 versions. Years on every version are 2005-01-01 to 2008-12-31. Ground clearance is 130 mm on all six. Peak torque is 355 Nm at 1800 rpm on all six. Boost is Turbo, layout is Front, transverse, injection is Distributed injection (multi-point), compression is 9.5, bore × stroke is 89 × 74.8, valves per cylinder are 4. Wheel size is not measured on every version. CO₂ and eco class are not measured.

Because generation does not split the list, grouping by mass and tank is more useful than grouping by year.

Heavier pair (tank 60 L, kerb 1590 kg, gross 2215 kg):

• 2.8 MT 280 hp — 0–100 in 6.5 s, top speed 250
• 2.8 MT 255 hp — 0–100 in 6.9 s, top speed 250

Lighter Automatic outlier (tank 60 L, kerb 1475 kg, gross 2190 kg):

• 2.8 AT 280 hp — 0–100 in 7.0 s, top speed 247, fuel 98

Lighter trio (tank 61 L, kerb 1510 kg, gross 2070 kg):

• 2.8 MT 280 hp — 0–100 in 6.3 s, top speed 250
• 2.8 AT 280 hp — 0–100 in 6.3 s, top speed 250
• 2.8 MT 255 hp — 0–100 in 6.7 s, top speed 250

The 80 kg kerb gap between the 1590 kg manuals and the 1510 kg trio is the largest chassis-side split in the catalogue. The 2.8 AT at 1475 kg is 115 kg lighter than the 1590 kg manuals, yet it is the slowest 0–100 car in the set.

Engines and specs

Two power outputs share one displacement. Specific output is 280 / 2.792 ≈ 100.3 hp per litre versus 255 / 2.792 ≈ 91.3 hp per litre. The extra 25 hp is +9.8% at the same 355 Nm.

Same name, different car: two 2.8 MT at 280 hp, two 2.8 MT at 255 hp, two 2.8 AT at 280 hp. Separate them by kerb mass and 0–100, not by the badge string.

Performance and economy (mpg / 0–100)

Fastest 0–100: 6.3 s — shared by the 1510 kg 2.8 MT 280 hp and the 1510 kg 2.8 AT 280 hp. On this pair the Automatic does not cost a tenth of a second.

Slowest 0–100: 7.0 s — the 1475 kg 2.8 AT 280 hp. Versus the fastest pair that is +0.7 s despite being 35 kg lighter than 1510 kg. It is also the only version limited to 247 rather than 250, and the only one specified for 98 fuel.

255 hp versus 280 hp, same mass band:

• At 1590 kg: 6.9 s versus 6.5 s (+0.4 s for the 255 hp car).
• At 1510 kg: 6.7 s versus 6.3 s (+0.4 s again).

The 25 hp gap buys a consistent 0.4 s, independent of which mass band you pick. Dropping 80 kg (1590 → 1510) at the same power also buys 0.2 s (6.5 → 6.3 at 280 hp; 6.9 → 6.7 at 255 hp). Power and mass add: the slowest manual (2.8 MT 255 hp, 1590 kg, 6.9 s) is 0.6 s behind the fastest manuals.

Mass per horsepower (kerb / hp):

• 2.8 AT 280 hp, 1475 kg: 5.27 kg/hp (lowest)
• 2.8 MT / 2.8 AT 280 hp, 1510 kg: 5.39 kg/hp
• 2.8 MT 280 hp, 1590 kg: 5.68 kg/hp
• 2.8 MT 255 hp, 1510 kg: 5.92 kg/hp
• 2.8 MT 255 hp, 1590 kg: 6.24 kg/hp (highest)

The light Automatic wins the paper ratio and loses the stopwatch. Do not buy on kg/hp alone.

Fuel (L/100 km, city / highway / combined):

• 2.8 MT 280 hp and 2.8 MT 255 hp at 1590 kg: 15.6 / 7.5 / 10.5
• 2.8 AT 280 hp at 1475 kg: 15.6 / 7.5 / 10.5 (same as the heavy manuals)
• 2.8 MT 280 hp and 2.8 MT 255 hp at 1510 kg: 15.5 / 7.4 / 10.4
• 2.8 AT 280 hp at 1510 kg: 17.2 / 7.4 / 11.0

The 1510 kg Automatic is the economy outlier: city use is +1.7 L/100 km versus the 1510 kg manuals (17.2 vs 15.5), combined +0.6 L/100 km (11.0 vs 10.4). Highway is identical at 7.4. The 255 hp cars do not use less fuel than the 280 hp cars in the same mass band — combined figures match exactly.

CO₂ is not measured. Eco class is not measured.

Dimensions and weight

Wheel sizes are not measured. Clearance is 130 mm on all six.

If you buy the Vectra OPC as an Estate 5-door for load, payload is the split that matters: 715 kg on the light 2.8 AT, 625 kg on the 1590 kg manuals, 560 kg on the 1510 kg trio. Choosing the fastest 0–100 cars costs 155 kg of payload versus the 1475 kg Automatic (715 − 560). The 61 L tank versus 60 L is +1 L — not a range argument by itself; combined consumption still dominates.

Brakes: front Ventilated disc on all six. Rear is Disc ventilated only on the 1475 kg 2.8 AT; the other five list rear Disc. Suspension is Independent, spring front and rear on every version.

Which version to choose

Want the shortest 0–100 in this catalogue: the 1510 kg 2.8 MT 280 hp or the 1510 kg 2.8 AT 280 hp. Both are 6.3 s and 250. Pick Manual if city fuel matters (15.5 vs 17.2). Pick Automatic if you accept 11.0 combined versus 10.4 for the same 0–100 time. Payload is 560 kg either way.

Want 280 hp without the 1510 kg band: the 1590 kg 2.8 MT 280 hp is 6.5 s — 0.2 s slower than the fastest pair, 80 kg heavier, tank 60 L, combined 10.5 versus 10.4. You gain 65 kg of payload (625 vs 560).

Want the 255 hp cars: they never beat a 280 hp car in the same mass band. Buy them only if you are staying in that power row. Then choose mass: 1510 kg 2.8 MT 255 hp at 6.7 s and 10.4 combined, or 1590 kg 2.8 MT 255 hp at 6.9 s, 10.5 combined, and 625 kg payload. There is no 255 hp Automatic in the data.

Want maximum payload: the 1475 kg 2.8 AT 280 hp at 715 kg. That is the trade: slowest sprint (7.0 s), lowest top speed (247), 98 fuel, rear Disc ventilated, combined still 10.5. It is not the “light equals fast” option.

Want the least city fuel among 280 hp Automatics: not the 1510 kg 2.8 AT — that is 17.2. The 1475 kg 2.8 AT matches the heavy manuals at 15.6.

What the extra 25 hp buys: 0.4 s to 100, same 355 Nm, same combined fuel in each mass band, same 250 top speed on the manuals. It does not buy a different gearbox count, drive, or body.

What 80 kg less kerb buys (1590 → 1510, same power and Manual): 0.2 s, −0.1 L/100 km combined, +1 L tank, −65 kg payload, gross down from 2215 to 2070.

Reliability / problems: not measured in this dataset. Do not infer them from the numbers above.

Bottom line with only these figures: the default buy for a driver who wants the catalogue’s best sprint and ordinary 95 fuel is the 1510 kg 2.8 MT 280 hp (6.3 s, 10.4 combined). Take the matching 2.8 AT only if you want that same 6.3 s without a clutch and will live with 17.2 city. Take a 1590 kg 2.8 MT if payload 625 kg outweighs 0.2 s. Take the 1475 kg 2.8 AT if 715 kg payload and 98 fuel are the point, not the stopwatch. Skip 255 hp unless that is the car in front of you — the data give it no economy advantage and a fixed 0.4 s penalty.