2006 BMW 525 vs. 2004 BMW 645
To start off, 2006 BMW 525 is newer by 2 year(s). Which means there will be less support and parts availability for 2004 BMW 645. In addition, the cost of maintenance, including insurance, on 2004 BMW 645 would be higher. At 4,392 cc (8 cylinders), 2004 BMW 645 is equipped with a bigger engine. In terms of performance, 2004 BMW 645 (322 HP @ 7400 RPM) has 107 more horse power than 2006 BMW 525. (215 HP @ 6250 RPM) In normal driving conditions, 2004 BMW 645 should accelerate faster than 2006 BMW 525.
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, 2004 BMW 645 (447 Nm) has 196 more torque (in Nm) than 2006 BMW 525. (251 Nm). This means 2004 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2006 BMW 525.
Compare all specifications:
| 2006 BMW 525 | 2004 BMW 645 | |
| Make | BMW | BMW |
| Model | 525 | 645 |
| Year Released | 2006 | 2004 |
| Body Type | Sedan | Coupe |
| Engine Position | Front | Front |
| Engine Size | 2999 cc | 4392 cc |
| Horse Power | 215 HP | 322 HP |
| Engine RPM | 6250 RPM | 7400 RPM |
| Torque | 251 Nm | 447 Nm |
| Engine Bore Size | 85.1 mm | 92 mm |
| Engine Stroke Size | 87.9 mm | 83 mm |
| Drive Type | Rear | Rear |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Length | 4860 mm | 4840 mm |
| Vehicle Width | 1850 mm | 1860 mm |
| Vehicle Height | 1470 mm | 1380 mm |
| Wheelbase Size | 2890 mm | 2790 mm |
| Fuel Consumption | 8.4 L/100km | 9.4 L/100km |
| Fuel Consumption City | 12.4 L/100km | 13.8 L/100km |
| Fuel Consumption Overall | 10.7 L/100km | 11.8 L/100km |
| Fuel Tank Capacity | 70 L | 70 L |
