2008 BMW X5 vs. 2003 BMW 645
To start off, 2008 BMW X5 is newer by 5 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), 2008 BMW X5 is equipped with a bigger engine. In terms of performance, 2008 BMW X5 (350 HP @ 6300 RPM) has 25 more horse power than 2003 BMW 645. (325 HP @ 6100 RPM). In normal driving conditions, 2008 BMW X5 should accelerate faster than 2003 BMW 645. With that said, vehicle weight also plays an important factor in acceleration. 2003 BMW 645 weights approximately 136 kg more than 2008 BMW X5.
Because 2008 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, 2008 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, 2008 BMW X5 (475 Nm @ 3400 RPM) has 25 more torque (in Nm) than 2003 BMW 645. (450 Nm @ 3600 RPM). This means 2008 BMW X5 will have an easier job in driving up hills or pulling heavy equipment than 2003 BMW 645. 2008 BMW X5 has automatic transmission and 2003 BMW 645 has manual transmission. 2003 BMW 645 will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2008 BMW X5 will be easier to drive especially in heavy traffic.
Compare all specifications:
| 2008 BMW X5 | 2003 BMW 645 | |
| Make | BMW | BMW |
| Model | X5 | 645 |
| Year Released | 2008 | 2003 |
| Body Type | SUV | Coupe |
| Engine Position | Front | Front |
| Engine Size | 4799 cc | 4398 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 350 HP | 325 HP |
| Engine RPM | 6300 RPM | 6100 RPM |
| Torque | 475 Nm | 450 Nm |
| Torque RPM | 3400 RPM | 3600 RPM |
| Engine Bore Size | 93 mm | 92 mm |
| Engine Stroke Size | 88.3 mm | 82.7 mm |
| Engine Compression Ratio | 10.5:1 | 10.5:1 |
| Top Speed | 242 km/hour | 250 km/hour |
| Acceleration 0-100mph | 6.5 seconds | 5.9 seconds |
| Drive Type | 4WD | Rear |
| Transmission Type | Automatic | Manual |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 5 doors | 2 doors |
| Vehicle Weight | 1554 kg | 1690 kg |
| Vehicle Length | 4860 mm | 4830 mm |
| Vehicle Width | 1940 mm | 1860 mm |
| Vehicle Height | 1740 mm | 1380 mm |
| Wheelbase Size | 2940 mm | 2890 mm |
| Fuel Consumption Highway | 12.4 L/100km | 8.6 L/100km |
| Fuel Consumption City | 16.8 L/100km | 17.2 L/100km |
| Fuel Consumption Overall | 12.5 L/100km | 11.7 L/100km |
| Fuel Tank Capacity | 85 L | 70 L |
