2003 BMW 645 vs. 2012 BMW 525
To start off, 2012 BMW 525 is newer by 9 year(s). Which means there will be less support and parts availability for 2003 BMW 645. In addition, the cost of maintenance, including insurance, on 2003 BMW 645 would be higher. At 4,398 cc (8 cylinders), 2003 BMW 645 is equipped with a bigger engine. In terms of performance, 2003 BMW 645 (310 HP @ 6000 RPM) has 93 more horse power than 2012 BMW 525. (217 HP @ 4400 RPM). In normal driving conditions, 2003 BMW 645 should accelerate faster than 2012 BMW 525. With that said, vehicle weight also plays an important factor in acceleration. 2012 BMW 525 weights approximately 22 kg more than 2003 BMW 645.
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, both vehicles can yield 450 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 645 | 2012 BMW 525 | |
| Make | BMW | BMW |
| Model | 645 | 525 |
| Year Released | 2003 | 2012 |
| Body Type | Coupe | Sedan |
| Engine Position | Front | Front |
| Engine Size | 4398 cc | 1995 cc |
| Engine Cylinders | 8 cylinders | 4 cylinders |
| Engine Type | V | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 310 HP | 217 HP |
| Engine RPM | 6000 RPM | 4400 RPM |
| Torque | 450 Nm | 450 Nm |
| Torque RPM | 3600 RPM | 2500 RPM |
| Engine Bore Size | 92 mm | 90 mm |
| Engine Stroke Size | 82.7 mm | 84 mm |
| Top Speed | 250 km/hour | 243 km/hour |
| Acceleration 0-100mph | 5.9 seconds | 5.7 seconds |
| Drive Type | Rear | Rear |
| Transmission Type | Automatic | 8-speed shiftable automatic |
| Number of Seats | 4 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 1698 kg | 1720 kg |
| Vehicle Length | 4830 mm | 4899 mm |
| Vehicle Width | 1860 mm | 1860 mm |
| Vehicle Height | 1380 mm | 1464 mm |
| Wheelbase Size | 2790 mm | 2968 mm |
| Fuel Consumption Highway | 8 L/100km | 4.3 L/100km |
| Fuel Consumption City | 16.1 L/100km | 6.2 L/100km |
| Fuel Consumption Overall | 10.9 L/100km | 5 L/100km |
| Fuel Tank Capacity | 70 L | 70 L |
