2005 BMW 645 vs. 2004 Opel Omega
To start off, 2005 BMW 645 is newer by 1 year(s). Which means there will be less support and parts availability for 2004 Opel Omega. In addition, the cost of maintenance, including insurance, on 2004 Opel Omega would be higher. At 4,392 cc (8 cylinders), 2005 BMW 645 is equipped with a bigger engine. In terms of performance, 2005 BMW 645 (326 HP @ 6100 RPM) has 184 more horse power than 2004 Opel Omega. (142 HP @ 5400 RPM). In normal driving conditions, 2005 BMW 645 should accelerate faster than 2004 Opel Omega. With that said, vehicle weight also plays an important factor in acceleration. 2005 BMW 645 weights approximately 162 kg more than 2004 Opel Omega. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Both vehicles are rear wheel drive (RWD) - it offers better handling in dry conditions; in addition, if you are looking to drift, both vehicles do the job better than front wheel drive vehicles. With that said, do keep in mind that many other factors such as speed and the wear on your tires can also have significant impact on traction and control. Let's talk about torque, 2005 BMW 645 (447 Nm @ 3600 RPM) has 238 more torque (in Nm) than 2004 Opel Omega. (209 Nm @ 4000 RPM). This means 2005 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2004 Opel Omega.
Compare all specifications:
| 2005 BMW 645 | 2004 Opel Omega | |
| Make | BMW | Opel |
| Model | 645 | Omega |
| Year Released | 2005 | 2004 |
| Engine Position | Front | Front |
| Engine Size | 4392 cc | 2198 cc |
| Engine Cylinders | 8 cylinders | 4 cylinders |
| Engine Type | V | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 326 HP | 142 HP |
| Engine RPM | 6100 RPM | 5400 RPM |
| Torque | 447 Nm | 209 Nm |
| Torque RPM | 3600 RPM | 4000 RPM |
| Engine Bore Size | 92 mm | 86 mm |
| Engine Stroke Size | 83 mm | 94.6 mm |
| Fuel Type | Gasoline - Premium | Gasoline |
| Top Speed | 250 km/hour | 210 km/hour |
| Acceleration 0-100mph | 6.1 seconds | 10.8 seconds |
| Drive Type | Rear | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 4 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 1895 kg | 1733 kg |
| Vehicle Length | 4830 mm | 4830 mm |
| Vehicle Width | 1860 mm | 1780 mm |
| Vehicle Height | 1380 mm | 1460 mm |
| Wheelbase Size | 2890 mm | 2840 mm |
| Fuel Consumption Overall | 12.8 L/100km | 7.8 L/100km |
| Fuel Tank Capacity | 70 L | 75 L |
