2009 Mercedes-Benz S vs. 2006 BMW 645
To start off, 2009 Mercedes-Benz S is newer by 3 year(s). Which means there will be less support and parts availability for 2006 BMW 645. In addition, the cost of maintenance, including insurance, on 2006 BMW 645 would be higher. At 5,513 cc (12 cylinders), 2009 Mercedes-Benz S is equipped with a bigger engine. In terms of performance, 2009 Mercedes-Benz S (510 HP @ 5000 RPM) has 182 more horse power than 2006 BMW 645. (328 HP @ 6100 RPM). In normal driving conditions, 2009 Mercedes-Benz S should accelerate faster than 2006 BMW 645. With that said, vehicle weight also plays an important factor in acceleration. 2006 BMW 645 weights approximately 467 kg more than 2009 Mercedes-Benz S.
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, 2009 Mercedes-Benz S (830 Nm @ 1800 RPM) has 380 more torque (in Nm) than 2006 BMW 645. (450 Nm @ 3600 RPM). This means 2009 Mercedes-Benz S will have an easier job in driving up hills or pulling heavy equipment than 2006 BMW 645.
Compare all specifications:
| 2009 Mercedes-Benz S | 2006 BMW 645 | |
| Make | Mercedes-Benz | BMW |
| Model | S | 645 |
| Year Released | 2009 | 2006 |
| Body Type | Sedan | Coupe |
| Engine Position | Front | Front |
| Engine Size | 5513 cc | 4398 cc |
| Engine Cylinders | 12 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 3 valves | 4 valves |
| Horse Power | 510 HP | 328 HP |
| Engine RPM | 5000 RPM | 6100 RPM |
| Torque | 830 Nm | 450 Nm |
| Torque RPM | 1800 RPM | 3600 RPM |
| Engine Compression Ratio | 9.0:1 | 10.0:1 |
| Fuel Type | Diesel | Gasoline - Premium |
| Drive Type | Rear | Rear |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Weight | 1225 kg | 1692 kg |
| Vehicle Length | 5210 mm | 4830 mm |
| Vehicle Width | 1880 mm | 1860 mm |
| Vehicle Height | 1480 mm | 1380 mm |
| Wheelbase Size | 3170 mm | 2790 mm |
| Fuel Consumption Overall | 18.1 L/100km | 11.8 L/100km |
| Fuel Tank Capacity | 90 L | 70 L |
