2008 BMW X3 vs. 2005 BMW 645
To start off, 2008 BMW X3 is newer by 3 year(s). Which means there will be less support and parts availability for 2005 BMW 645. In addition, the cost of maintenance, including insurance, on 2005 BMW 645 would be higher. At 4,390 cc (8 cylinders), 2005 BMW 645 is equipped with a bigger engine. In terms of performance, 2005 BMW 645 (338 HP @ 6100 RPM) has 149 more horse power than 2008 BMW X3. (189 HP @ 6000 RPM) In normal driving conditions, 2005 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 2005 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, 2005 BMW 645 (439 Nm @ 3600 RPM) has 194 more torque (in Nm) than 2008 BMW X3. (245 Nm @ 3500 RPM). This means 2005 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2008 BMW X3. 2005 BMW 645 has automatic transmission and 2008 BMW X3 has manual transmission. 2008 BMW X3 will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2005 BMW 645 will be easier to drive especially in heavy traffic.
Compare all specifications:
| 2008 BMW X3 | 2005 BMW 645 | |
| Make | BMW | BMW |
| Model | X3 | 645 |
| Year Released | 2008 | 2005 |
| Body Type | SUV | Coupe |
| Engine Position | Front | Front |
| Engine Size | 2492 cc | 4390 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 189 HP | 338 HP |
| Engine RPM | 6000 RPM | 6100 RPM |
| Torque | 245 Nm | 439 Nm |
| Torque RPM | 3500 RPM | 3600 RPM |
| Engine Bore Size | 84 mm | 92 mm |
| Engine Stroke Size | 75 mm | 83 mm |
| Engine Compression Ratio | 10.5:1 | 10.5:1 |
| Fuel Type | Gasoline | Gasoline - Premium |
| Top Speed | 213 km/hour | 250 km/hour |
| Acceleration 0-100mph | 9.6 seconds | 5.6 seconds |
| Drive Type | Rear | Rear |
| Transmission Type | Manual | Automatic |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 5 doors | 2 doors |
| Vehicle Weight | 1740 kg | 1715 kg |
| Vehicle Length | 4870 mm | 4830 mm |
| Vehicle Height | 1470 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 |
