2008 BMW X3 vs. 2004 BMW 645
To start off, 2008 BMW X3 is newer by 4 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 4,392 cc (8 cylinders), 2004 BMW 645 is equipped with a bigger engine. In terms of performance, 2004 BMW 645 (322 HP @ 7400 RPM) has 133 more horse power than 2008 BMW X3. (189 HP @ 6000 RPM) In normal driving conditions, 2004 BMW 645 should accelerate faster than 2008 BMW X3. With that said, vehicle weight also plays an important factor in acceleration. 2008 BMW X3 weights approximately 25 kg more than 2004 BMW 645.
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, 2004 BMW 645 (447 Nm) has 202 more torque (in Nm) than 2008 BMW X3. (245 Nm). This means 2004 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2008 BMW X3.
Compare all specifications:
| 2008 BMW X3 | 2004 BMW 645 | |
| Make | BMW | BMW |
| Model | X3 | 645 |
| Year Released | 2008 | 2004 |
| Body Type | SUV | Coupe |
| Engine Position | Front | Front |
| Engine Size | 2494 cc | 4392 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 189 HP | 322 HP |
| Engine RPM | 6000 RPM | 7400 RPM |
| Torque | 245 Nm | 447 Nm |
| Engine Bore Size | 84.1 mm | 92 mm |
| Engine Stroke Size | 75 mm | 83 mm |
| Engine Compression Ratio | 10.5:1 | 10.5:1 |
| Drive Type | Rear | Rear |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 5 doors | 2 doors |
| Vehicle Weight | 1740 kg | 1715 kg |
| Vehicle Length | 5050 mm | 4840 mm |
| Vehicle Height | 1480 mm | 1380 mm |
| Wheelbase Size | 2800 mm | 2790 mm |
| Fuel Consumption Overall | 12.9 L/100km | 11.8 L/100km |
| Fuel Tank Capacity | 67 L | 70 L |
