2006 BMW 645 vs. 2004 Mercedes-Benz S
To start off, 2006 BMW 645 is newer by 2 year(s). Which means there will be less support and parts availability for 2004 Mercedes-Benz S. In addition, the cost of maintenance, including insurance, on 2004 Mercedes-Benz S would be higher. At 5,441 cc (8 cylinders), 2004 Mercedes-Benz S is equipped with a bigger engine. In terms of performance, 2004 Mercedes-Benz S (494 HP @ 4200 RPM) has 166 more horse power than 2006 BMW 645. (328 HP @ 6100 RPM) In normal driving conditions, 2004 Mercedes-Benz S should accelerate faster than 2006 BMW 645. With that said, vehicle weight also plays an important factor in acceleration. 2004 Mercedes-Benz S weights approximately 114 kg more than 2006 BMW 645. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
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 Mercedes-Benz S (700 Nm @ 2750 RPM) has 250 more torque (in Nm) than 2006 BMW 645. (450 Nm @ 3600 RPM). This means 2004 Mercedes-Benz S will have an easier job in driving up hills or pulling heavy equipment than 2006 BMW 645.
Compare all specifications:
| 2006 BMW 645 | 2004 Mercedes-Benz S | |
| Make | BMW | Mercedes-Benz |
| Model | 645 | S |
| Year Released | 2006 | 2004 |
| Body Type | Convertible | Sedan |
| Engine Position | Front | Front |
| Engine Size | 4398 cc | 5441 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 2 valves | 3 valves |
| Horse Power | 328 HP | 494 HP |
| Engine RPM | 6100 RPM | 4200 RPM |
| Torque | 450 Nm | 700 Nm |
| Torque RPM | 3600 RPM | 2750 RPM |
| Engine Bore Size | 92 mm | 97 mm |
| Engine Stroke Size | 83 mm | 92 mm |
| Engine Compression Ratio | 10.0:1 | 9.0:1 |
| Drive Type | Rear | Rear |
| Number of Seats | 4 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 1836 kg | 1950 kg |
| Vehicle Length | 4830 mm | 5170 mm |
| Vehicle Width | 1860 mm | 1860 mm |
| Vehicle Height | 1380 mm | 1460 mm |
| Wheelbase Size | 2790 mm | 3090 mm |
| Fuel Tank Capacity | 70 L | 88 L |
