2008 Audi S8 vs. 2009 BMW 635
To start off, 2009 BMW 635 is newer by 1 year(s). Which means there will be less support and parts availability for 2008 Audi S8. In addition, the cost of maintenance, including insurance, on 2008 Audi S8 would be higher. At 5,204 cc (10 cylinders), 2008 Audi S8 is equipped with a bigger engine. In terms of performance, 2008 Audi S8 (450 HP @ 7000 RPM) has 168 more horse power than 2009 BMW 635. (282 HP @ 4400 RPM). In normal driving conditions, 2008 Audi S8 should accelerate faster than 2009 BMW 635.
Because 2008 Audi S8 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, 2008 Audi S8 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 40 more torque (in Nm) than 2008 Audi S8. (540 Nm @ 3500 RPM). This means 2009 BMW 635 will have an easier job in driving up hills or pulling heavy equipment than 2008 Audi S8.
Compare all specifications:
| 2008 Audi S8 | 2009 BMW 635 | |
| Make | Audi | BMW |
| Model | S8 | 635 |
| Year Released | 2008 | 2009 |
| Body Type | Sedan | Convertible |
| Engine Position | Front | Front |
| Engine Size | 5204 cc | 2993 cc |
| Engine Cylinders | 10 cylinders | 6 cylinders |
| Engine Type | V | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 450 HP | 282 HP |
| Engine RPM | 7000 RPM | 4400 RPM |
| Torque | 540 Nm | 580 Nm |
| Torque RPM | 3500 RPM | 1750 RPM |
| Engine Bore Size | 84.5 mm | 84 mm |
| Engine Stroke Size | 92.8 mm | 90 mm |
| Engine Compression Ratio | 12.5:1 | 17.0:1 |
| Fuel Type | Gasoline - Premium | Diesel |
| Top Speed | 249 km/hour | 250 km/hour |
| Drive Type | AWD | Rear |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Length | 5070 mm | 4830 mm |
| Vehicle Width | 1900 mm | 1860 mm |
| Vehicle Height | 1430 mm | 1380 mm |
| Wheelbase Size | 2950 mm | 2790 mm |
| Fuel Consumption Overall | 15.7 L/100km | 7.4 L/100km |
| Fuel Tank Capacity | 90 L | 70 L |
