2004 BMW 645 vs. 2006 BMW X5
To start off, 2006 BMW X5 is newer by 2 year(s). Which means there will be less support and parts availability for 2004 BMW 645. In addition, the cost of maintenance, including insurance, on 2004 BMW 645 would be higher. At 4,398 cc (8 cylinders), 2004 BMW 645 is equipped with a bigger engine. In terms of performance, 2004 BMW 645 (328 HP @ 6100 RPM) has 101 more horse power than 2006 BMW X5. (227 HP @ 5900 RPM). In normal driving conditions, 2004 BMW 645 should accelerate faster than 2006 BMW X5. With that said, vehicle weight also plays an important factor in acceleration. 2006 BMW X5 weights approximately 380 kg more than 2004 BMW 645.
Because 2006 BMW X5 is four wheel drive (4WD), it will have significant more traction and grip than 2004 BMW 645. In wet, icy, snow, or gravel driving conditions, 2006 BMW X5 will offer significantly more control. 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, 2004 BMW 645 (450 Nm @ 3600 RPM) has 160 more torque (in Nm) than 2006 BMW X5. (290 Nm @ 3500 RPM). This means 2004 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2006 BMW X5.
Compare all specifications:
| 2004 BMW 645 | 2006 BMW X5 | |
| Make | BMW | BMW |
| Model | 645 | X5 |
| Year Released | 2004 | 2006 |
| Body Type | Coupe | SUV |
| Engine Position | Front | Front |
| Engine Size | 4398 cc | 2978 cc |
| Engine Cylinders | 8 cylinders | 6 cylinders |
| Engine Type | V | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 328 HP | 227 HP |
| Engine RPM | 6100 RPM | 5900 RPM |
| Torque | 450 Nm | 290 Nm |
| Torque RPM | 3600 RPM | 3500 RPM |
| Engine Bore Size | 92 mm | 84.1 mm |
| Engine Stroke Size | 82.7 mm | 89.7 mm |
| Engine Compression Ratio | 10.0:1 | 10.2:1 |
| Fuel Type | Gasoline - Premium | Gasoline |
| Top Speed | 250 km/hour | 209 km/hour |
| Drive Type | Rear | 4WD |
| Transmission Type | Manual | Manual |
| Number of Seats | 4 seats | 5 seats |
| Number of Doors | 2 doors | 5 doors |
| Vehicle Weight | 1690 kg | 2070 kg |
| Vehicle Length | 4830 mm | 4670 mm |
| Vehicle Width | 1860 mm | 1880 mm |
| Vehicle Height | 1380 mm | 1770 mm |
| Wheelbase Size | 2830 mm | 2830 mm |
| Fuel Consumption Overall | 12 L/100km | 12.7 L/100km |
| Fuel Tank Capacity | 70 L | 93 L |
