Comparison Mercedes-Benz S-class (W221) S 320 CDI (235 Hp) G-TRONIC & Opel Signum (facelift 2005) 2.8i V6 24V Turbo (230 Hp)
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| Brand: | Mercedes-Benz | Opel |
| Model: | S-class | Signum |
| Generation: | S-class (W221) | Signum (facelift 2005) |
| Engine / modification: | S 320 CDI (235 Hp) G-TRONIC | 2.8i V6 24V Turbo (230 Hp) |
| Production start: | 2006 year | 2005 year |
| Production end: | 2009 year | 2006 year |
| Coupe type: | Sedan | Hatchback |
| Num. of Doors: | 4 | 5 |
| Num. of seats: | 5 | 5 |
| Fuel consumption / economy - urban: | 11.6-11.8 l/100 km | 15.7 l/100 km |
| Fuel consumption / economy - extra urban: | 6.4-6.6 l/100 km | 7.6 l/100 km |
| Fuel consumption / economy - combined: | 8.3-8.5 l/100 km | |
| Fuel Type: | Diesel | Petrol (Gasoline) |
| Drag coefficient: | 0.32 | |
| Fuel tank volume: | 90 l | 60 l |
| CO2 emissions: | 220-225 g/km | |
| Power: | 235 hp | 230 hp |
| Max power in: | 3600 rpm. | 5500 rpm. |
| Maximum speed: | 250 km/h | 243 km/h |
| Acceleration from 0 to 100 km/h: | 7.5 sec | 7.6 sec |
| Torque: | 540 Nm @ 1600-2400 rpm. | 330 Nm |
| Model Engine: | OM 642.930 | |
| Engine position: | Front, longitudinal | Front, transverse |
| Engine displacement: | 2987 cm3 | 2792 cm3 |
| Engine oil capacity: | 8.5 l | |
| Coolant: | 7.5 l | |
| Fuel System: | Diesel Commonrail | Multi-point injection |
| Aspiration / Turbine: | Turbocharging | Turbocharging |
| Position of cylinders: | V engine | V engine |
| Valvetrain: | DOHC | |
| Number of cylinders: | 6 | 6 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 18 | 9.5 |
| Piston Stroke: | 92 mm | 74.8 mm |
| Cylinder Bore: | 83 mm | 89 mm |
| Wheel Drive: | Rear wheel drive | Front wheel drive |
| Number of Gears (automatic transmission): | 7 | |
| Number of Gears (manual transmission): | 6 | |
| Length: | 5079 mm | 4651 mm |
| Width: | 1871 mm | 1798 mm |
| Width including mirrors: | 2115 mm | |
| Height: | 1473 mm | 1466 mm |
| Wheelbase: | 3035 mm | 2830 mm |
| Front track: | 1604 mm | 1536 mm |
| Rear (Back) track: | 1606 mm | 1525 mm |
| Front overhang: | 871 mm | |
| Rear overhang: | 1173 mm | |
| Minimum volume of Luggage (trunk): | 560 l | 365 l |
| Maximum amount of Luggage (trunk): | 1410 l | |
| Front suspension: | Pneumatic elastic element | Independent, spring |
| Rear suspension: | Pneumatic elastic element | Independent, spring |
| Max weight: | 2550 kg | 2175 kg |
| Front brakes: | Ventilated discs | Disc |
| Rear brakes: | Disc | Disc |
| Kerb Weight: | 1880 kg | 1580 kg |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | |
| Minimum turning circle (turning diameter): | 11.8 m | |
| Tire size: | 235/55 R17 | 225/50 R17 |
| Wheel rims size: | 8J x 17 | R17 |