2003 BMW 645 vs. 2005 Mercedes-Benz S
To start off, 2005 Mercedes-Benz S is newer by 2 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 62 more horse power than 2005 Mercedes-Benz S. (248 HP @ 4000 RPM). In normal driving conditions, 2003 BMW 645 should accelerate faster than 2005 Mercedes-Benz S. With that said, vehicle weight also plays an important factor in acceleration. 2005 Mercedes-Benz S weights approximately 342 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, 2005 Mercedes-Benz S (560 Nm @ 1700 RPM) has 110 more torque (in Nm) than 2003 BMW 645. (450 Nm @ 3600 RPM). This means 2005 Mercedes-Benz S will have an easier job in driving up hills or pulling heavy equipment than 2003 BMW 645.
Compare all specifications:
| 2003 BMW 645 | 2005 Mercedes-Benz S | |
| Make | BMW | Mercedes-Benz |
| Model | 645 | S |
| Year Released | 2003 | 2005 |
| Body Type | Coupe | Sedan |
| Engine Position | Front | Front |
| Engine Size | 4398 cc | 3997 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 310 HP | 248 HP |
| Engine RPM | 6000 RPM | 4000 RPM |
| Torque | 450 Nm | 560 Nm |
| Torque RPM | 3600 RPM | 1700 RPM |
| Engine Bore Size | 92 mm | 86 mm |
| Engine Stroke Size | 82.7 mm | 86 mm |
| Engine Compression Ratio | 10.5:1 | 19.0:1 |
| Top Speed | 250 km/hour | 250 km/hour |
| Acceleration 0-100mph | 5.9 seconds | 7.8 seconds |
| Drive Type | Rear | Rear |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 4 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 1698 kg | 2040 kg |
| Vehicle Length | 4830 mm | 5160 mm |
| Vehicle Width | 1860 mm | 1860 mm |
| Vehicle Height | 1380 mm | 1450 mm |
| Wheelbase Size | 2790 mm | 2970 mm |
| Fuel Consumption Overall | 10.9 L/100km | 9.6 L/100km |
| Fuel Tank Capacity | 70 L | 88 L |
