2003 BMW 645 vs. 2007 BMW X5
To start off, 2007 BMW X5 is newer by 4 year(s). Which means there will be less support and parts availability for 2003 BMW 645. In addition, the cost of maintenance, including insurance, on 2003 BMW 645 would be higher. At 4,799 cc (8 cylinders), 2007 BMW X5 is equipped with a bigger engine. In terms of performance, 2007 BMW X5 (350 HP @ 6300 RPM) has 40 more horse power than 2003 BMW 645. (310 HP @ 6000 RPM) In normal driving conditions, 2007 BMW X5 should accelerate faster than 2003 BMW 645. With that said, vehicle weight also plays an important factor in acceleration. 2007 BMW X5 weights approximately 502 kg more than 2003 BMW 645. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2007 BMW X5 is four wheel drive (4WD), it will have significant more traction and grip than 2003 BMW 645. In wet, icy, snow, or gravel driving conditions, 2007 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, 2007 BMW X5 (475 Nm @ 3400 RPM) has 25 more torque (in Nm) than 2003 BMW 645. (450 Nm @ 3600 RPM). This means 2007 BMW X5 will have an easier job in driving up hills or pulling heavy equipment than 2003 BMW 645.
Compare all specifications:
| 2003 BMW 645 | 2007 BMW X5 | |
| Make | BMW | BMW |
| Model | 645 | X5 |
| Year Released | 2003 | 2007 |
| Body Type | Coupe | SUV |
| Engine Position | Front | Front |
| Engine Size | 4398 cc | 4799 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 310 HP | 350 HP |
| Engine RPM | 6000 RPM | 6300 RPM |
| Torque | 450 Nm | 475 Nm |
| Torque RPM | 3600 RPM | 3400 RPM |
| Engine Compression Ratio | 10.5:1 | 10.5:1 |
| Top Speed | 250 km/hour | 237 km/hour |
| Acceleration 0-100mph | 5.9 seconds | 6.5 seconds |
| Drive Type | Rear | 4WD |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 4 seats | 5 seats |
| Number of Doors | 2 doors | 5 doors |
| Vehicle Weight | 1698 kg | 2200 kg |
| Vehicle Length | 4830 mm | 4670 mm |
| Vehicle Width | 1860 mm | 1940 mm |
| Vehicle Height | 1380 mm | 1740 mm |
| Wheelbase Size | 2790 mm | 2940 mm |
| Fuel Consumption Overall | 10.9 L/100km | 12.5 L/100km |
| Fuel Tank Capacity | 70 L | 85 L |
