2009 BMW 635 vs. 2011 Audi A8
To start off, 2011 Audi A8 is newer by 2 year(s). Which means there will be less support and parts availability for 2009 BMW 635. In addition, the cost of maintenance, including insurance, on 2009 BMW 635 would be higher. At 4,200 cc (8 cylinders), 2011 Audi A8 is equipped with a bigger engine. In terms of performance, 2011 Audi A8 (372 HP @ 6800 RPM) has 90 more horse power than 2009 BMW 635. (282 HP @ 4400 RPM) In normal driving conditions, 2011 Audi A8 should accelerate faster than 2009 BMW 635.
Because 2011 Audi A8 is all wheel drive (AWD), it will have significant more traction and grip than 2009 BMW 635. In wet, icy, snow, or gravel driving conditions, 2011 Audi A8 will offer significantly more control. 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 BMW 635 (580 Nm @ 1750 RPM) has 136 more torque (in Nm) than 2011 Audi A8. (444 Nm @ 3500 RPM). This means 2009 BMW 635 will have an easier job in driving up hills or pulling heavy equipment than 2011 Audi A8.
Compare all specifications:
| 2009 BMW 635 | 2011 Audi A8 | |
| Make | BMW | Audi |
| Model | 635 | A8 |
| Year Released | 2009 | 2011 |
| Body Type | Convertible | Sedan |
| Engine Position | Front | Front |
| Engine Size | 2993 cc | 4200 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 282 HP | 372 HP |
| Engine RPM | 4400 RPM | 6800 RPM |
| Torque | 580 Nm | 444 Nm |
| Torque RPM | 1750 RPM | 3500 RPM |
| Fuel Type | Diesel | Gasoline |
| Drive Type | Rear | AWD |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 4 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Length | 4830 mm | 5268 mm |
| Vehicle Width | 1860 mm | 1948 mm |
| Vehicle Height | 1380 mm | 1471 mm |
| Wheelbase Size | 2790 mm | 3122 mm |
| Fuel Tank Capacity | 70 L | 90 L |
