2006 BMW 645 vs. 2013 BMW X3
To start off, 2013 BMW X3 is newer by 7 year(s). Which means there will be less support and parts availability for 2006 BMW 645. In addition, the cost of maintenance, including insurance, on 2006 BMW 645 would be higher. At 4,398 cc (8 cylinders), 2006 BMW 645 is equipped with a bigger engine. In terms of performance, 2006 BMW 645 (328 HP @ 6100 RPM) has 91 more horse power than 2013 BMW X3. (237 HP @ 5000 RPM). In normal driving conditions, 2006 BMW 645 should accelerate faster than 2013 BMW X3. With that said, vehicle weight also plays an important factor in acceleration. 2013 BMW X3 weights approximately 29 kg more than 2006 BMW 645.
Because 2013 BMW X3 is all wheel drive (AWD), it will have significant more traction and grip than 2006 BMW 645. In wet, icy, snow, or gravel driving conditions, 2013 BMW X3 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, 2006 BMW 645 (450 Nm @ 3600 RPM) has 97 more torque (in Nm) than 2013 BMW X3. (353 Nm @ 4800 RPM). This means 2006 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2013 BMW X3. 2013 BMW X3 has automatic transmission and 2006 BMW 645 has manual transmission. 2006 BMW 645 will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2013 BMW X3 will be easier to drive especially in heavy traffic.
Compare all specifications:
| 2006 BMW 645 | 2013 BMW X3 | |
| Make | BMW | BMW |
| Model | 645 | X3 |
| Year Released | 2006 | 2013 |
| Body Type | Convertible | SUV |
| Engine Position | Front | Front |
| Engine Size | 4398 cc | 1997 cc |
| Engine Cylinders | 8 cylinders | 4 cylinders |
| Engine Type | V | in-line |
| Valves per Cylinder | 2 valves | 4 valves |
| Horse Power | 328 HP | 237 HP |
| Engine RPM | 6100 RPM | 5000 RPM |
| Torque | 450 Nm | 353 Nm |
| Torque RPM | 3600 RPM | 4800 RPM |
| Engine Bore Size | 92 mm | 84 mm |
| Engine Stroke Size | 83 mm | 90 mm |
| Engine Compression Ratio | 10.0:1 | 10.0 :1 |
| Fuel Type | Gasoline | Gasoline |
| Drive Type | Rear | AWD |
| Transmission Type | Manual | 8-speed automatic |
| Number of Seats | 4 seats | 5 seats |
| Number of Doors | 2 doors | 5 doors |
| Vehicle Weight | 1836 kg | 1865 kg |
| Vehicle Length | 4830 mm | 4648 mm |
| Vehicle Width | 1860 mm | 2098 mm |
| Vehicle Height | 1380 mm | 1661 mm |
| Wheelbase Size | 2790 mm | 2810 mm |
| Fuel Tank Capacity | 70 L | 67 L |
