2006 BMW Z4 vs. 2003 BMW X5
To start off, 2006 BMW Z4 is newer by 3 year(s). Which means there will be less support and parts availability for 2003 BMW X5. In addition, the cost of maintenance, including insurance, on 2003 BMW X5 would be higher. At 2,993 cc (6 cylinders), 2003 BMW X5 is equipped with a bigger engine. In terms of performance, 2006 BMW Z4 (229 HP @ 5900 RPM) has 2 more horse power than 2003 BMW X5. (227 HP @ 6100 RPM). In normal driving conditions, 2006 BMW Z4 should accelerate faster than 2003 BMW X5. With that said, vehicle weight also plays an important factor in acceleration. 2003 BMW X5 weights approximately 440 kg more than 2006 BMW Z4.
Because 2003 BMW X5 is four wheel drive (4WD), it will have significant more traction and grip than 2006 BMW Z4. In wet, icy, snow, or gravel driving conditions, 2003 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, 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:
| 2006 BMW Z4 | 2003 BMW X5 | |
| Make | BMW | BMW |
| Model | Z4 | X5 |
| Year Released | 2006 | 2003 |
| Body Type | Convertible | SUV |
| Engine Position | Front | Front |
| Engine Size | 2979 cc | 2993 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 229 HP | 227 HP |
| Engine RPM | 5900 RPM | 6100 RPM |
| Torque | 300 Nm | 300 Nm |
| Torque RPM | 3500 RPM | 3500 RPM |
| Engine Bore Size | 84 mm | 84.1 mm |
| Engine Stroke Size | 90 mm | 89.6 mm |
| Engine Compression Ratio | 10.2:1 | 10.2:1 |
| Acceleration 0-100mph | 5.9 seconds | 8.3 seconds |
| Drive Type | Rear | 4WD |
| Transmission Type | Manual | Manual |
| Number of Seats | 2 seats | 5 seats |
| Number of Doors | 2 doors | 5 doors |
| Vehicle Weight | 1630 kg | 2070 kg |
| Vehicle Length | 4570 mm | 4670 mm |
| Vehicle Width | 1790 mm | 1880 mm |
| Vehicle Height | 1680 mm | 1720 mm |
| Wheelbase Size | 2500 mm | 2890 mm |
| Fuel Consumption Overall | 9.1 L/100km | 12.7 L/100km |
| Fuel Tank Capacity | 55 L | 93 L |
