2009 BMW 550 vs. 2012 BMW 640
To start off, 2012 BMW 640 is newer by 3 year(s). Which means there will be less support and parts availability for 2009 BMW 550. In addition, the cost of maintenance, including insurance, on 2009 BMW 550 would be higher. At 4,799 cc, 2009 BMW 550 is equipped with a bigger engine. In terms of performance, 2009 BMW 550 (362 HP @ 6300 RPM) has 51 more horse power than 2012 BMW 640. (311 HP @ 4400 RPM). In normal driving conditions, 2009 BMW 550 should accelerate faster than 2012 BMW 640. With that said, vehicle weight also plays an important factor in acceleration. 2012 BMW 640 weights approximately 128 kg more than 2009 BMW 550.
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, 2012 BMW 640 (630 Nm @ 1500 RPM) has 140 more torque (in Nm) than 2009 BMW 550. (490 Nm @ 3400 RPM). This means 2012 BMW 640 will have an easier job in driving up hills or pulling heavy equipment than 2009 BMW 550.
Compare all specifications:
| 2009 BMW 550 | 2012 BMW 640 | |
| Make | BMW | BMW |
| Model | 550 | 640 |
| Year Released | 2009 | 2012 |
| Engine Position | Front | Front |
| Engine Size | 4799 cc | 2993 cc |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 362 HP | 311 HP |
| Engine RPM | 6300 RPM | 4400 RPM |
| Torque | 490 Nm | 630 Nm |
| Torque RPM | 3400 RPM | 1500 RPM |
| Engine Bore Size | 93 mm | 90 mm |
| Engine Stroke Size | 88.3 mm | 84 mm |
| Fuel Type | Gasoline | Diesel |
| Top Speed | 250 km/hour | 250 km/hour |
| Acceleration 0-100mph | 5.9 seconds | 5.5 seconds |
| Drive Type | Rear | Rear |
| Transmission Type | Automatic | 8-speed shiftable automatic |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 5 doors | 2 doors |
| Vehicle Weight | 1662 kg | 1790 kg |
| Vehicle Length | 4850 mm | 4894 mm |
| Vehicle Width | 1470 mm | 1894 mm |
| Vehicle Height | 1850 mm | 1369 mm |
| Wheelbase Size | 2890 mm | 2855 mm |
| Fuel Consumption Overall | 11.1 L/100km | 5.5 L/100km |
| Fuel Tank Capacity | 70 L | 70 L |
