2007 BMW Z4 vs. 2006 BMW 525
To start off, 2007 BMW Z4 is newer by 1 year(s). Which means there will be less support and parts availability for 2006 BMW 525. In addition, the cost of maintenance, including insurance, on 2006 BMW 525 would be higher. At 3,199 cc (6 cylinders), 2007 BMW Z4 is equipped with a bigger engine. In terms of performance, 2007 BMW Z4 (358 HP @ 7900 RPM) has 143 more horse power than 2006 BMW 525. (215 HP @ 6500 RPM). In normal driving conditions, 2007 BMW Z4 should accelerate faster than 2006 BMW 525.
Because 2006 BMW 525 is four wheel drive (4WD), it will have significant more traction and grip than 2007 BMW Z4. In wet, icy, snow, or gravel driving conditions, 2006 BMW 525 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, 2007 BMW Z4 (385 Nm @ 4900 RPM) has 135 more torque (in Nm) than 2006 BMW 525. (250 Nm @ 2750 RPM). This means 2007 BMW Z4 will have an easier job in driving up hills or pulling heavy equipment than 2006 BMW 525.
Compare all specifications:
| 2007 BMW Z4 | 2006 BMW 525 | |
| Make | BMW | BMW |
| Model | Z4 | 525 |
| Year Released | 2007 | 2006 |
| Body Type | Convertible | Station Wagon |
| Engine Position | Front | Front |
| Engine Size | 3199 cc | 2497 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 358 HP | 215 HP |
| Engine RPM | 7900 RPM | 6500 RPM |
| Torque | 385 Nm | 250 Nm |
| Torque RPM | 4900 RPM | 2750 RPM |
| Engine Compression Ratio | 11.5:1 | 11.0:1 |
| Fuel Type | Gasoline | Gasoline - Premium |
| Drive Type | Rear | 4WD |
| Transmission Type | Manual | Manual |
| Number of Seats | 2 seats | 5 seats |
| Number of Doors | 2 doors | 5 doors |
| Vehicle Length | 4100 mm | 4850 mm |
| Vehicle Width | 1790 mm | 1850 mm |
| Vehicle Height | 1300 mm | 1500 mm |
| Wheelbase Size | 2500 mm | 2840 mm |
