2003 BMW 730 vs. 2006 BMW X3
To start off, 2006 BMW X3 is newer by 3 year(s). Which means there will be less support and parts availability for 2003 BMW 730. In addition, the cost of maintenance, including insurance, on 2003 BMW 730 would be higher. At 2,999 cc (6 cylinders), 2003 BMW 730 is equipped with a bigger engine. In terms of performance, both vehicles can yield 228 horse power. So under normal driving conditions, the acceleration of both vehicles should be relatively similar. With that said, vehicle weight also plays an important factor in acceleration. 2006 BMW X3 weights approximately 45 kg more than 2003 BMW 730.
Because 2006 BMW X3 is four wheel drive (4WD), it will have significant more traction and grip than 2003 BMW 730. In wet, icy, snow, or gravel driving conditions, 2006 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, both vehicles can yield 300 Nm of torque. So under normal driving conditions, the ability to climb up hills and pull heavy equipment should be relatively similar for both vehicles.
Compare all specifications:
| 2003 BMW 730 | 2006 BMW X3 | |
| Make | BMW | BMW |
| Model | 730 | X3 |
| Year Released | 2003 | 2006 |
| Body Type | Sedan | SUV |
| Engine Position | Front | Front |
| Engine Size | 2999 cc | 2978 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 228 HP | 228 HP |
| Engine RPM | 5900 RPM | 5900 RPM |
| Torque | 300 Nm | 300 Nm |
| Torque RPM | 3500 RPM | 3500 RPM |
| Engine Bore Size | 84.1 mm | 84 mm |
| Engine Stroke Size | 90 mm | 89.6 mm |
| Engine Compression Ratio | 10.2:1 | 10.0:1 |
| Fuel Type | Gasoline | Gasoline - Premium |
| Drive Type | Rear | 4WD |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 5 doors |
| Vehicle Weight | 1790 kg | 1835 kg |
| Vehicle Length | 5040 mm | 4570 mm |
| Vehicle Width | 1910 mm | 1860 mm |
| Vehicle Height | 1500 mm | 1680 mm |
| Wheelbase Size | 3000 mm | 2800 mm |
| Fuel Tank Capacity | 63 L | 67 L |
