2005 Audi RS6 vs. 2008 Audi S4
To start off, 2008 Audi S4 is newer by 3 year(s). Which means there will be less support and parts availability for 2005 Audi RS6. In addition, the cost of maintenance, including insurance, on 2005 Audi RS6 would be higher. At 4,163 cc (8 cylinders), 2005 Audi RS6 is equipped with a bigger engine. In terms of performance, 2008 Audi S4 (456 HP @ 6800 RPM) has 12 more horse power than 2005 Audi RS6. (444 HP @ 6300 RPM) In normal driving conditions, 2008 Audi S4 should accelerate faster than 2005 Audi RS6. With that said, vehicle weight also plays an important factor in acceleration. 2005 Audi RS6 weights approximately 15 kg more than 2008 Audi S4.
Both vehicles are four wheel drive (4WD) - it offers better handling, traction, and control in all driving conditions compared with front wheel drive or rear 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, 2005 Audi RS6 (560 Nm @ 1950 RPM) has 258 more torque (in Nm) than 2008 Audi S4. (302 Nm @ 3500 RPM). This means 2005 Audi RS6 will have an easier job in driving up hills or pulling heavy equipment than 2008 Audi S4. 2008 Audi S4 has automatic transmission and 2005 Audi RS6 has manual transmission. 2005 Audi RS6 will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2008 Audi S4 will be easier to drive especially in heavy traffic.
Compare all specifications:
| 2005 Audi RS6 | 2008 Audi S4 | |
| Make | Audi | Audi |
| Model | RS6 | S4 |
| Year Released | 2005 | 2008 |
| Body Type | Sedan | Convertible |
| Engine Position | Front | Front |
| Engine Size | 4163 cc | 4124 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 5 valves | 5 valves |
| Horse Power | 444 HP | 456 HP |
| Engine RPM | 6300 RPM | 6800 RPM |
| Torque | 560 Nm | 302 Nm |
| Torque RPM | 1950 RPM | 3500 RPM |
| Engine Compression Ratio | 9.0:1 | 11.0:1 |
| Fuel Type | Gasoline | Gasoline |
| Acceleration 0-100mph | 4.7 seconds | 6.1 seconds |
| Drive Type | 4WD | 4WD |
| Transmission Type | Manual | Automatic |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Weight | 1910 kg | 1895 kg |
| Vehicle Length | 4800 mm | 4580 mm |
| Vehicle Width | 1820 mm | 1400 mm |
| Vehicle Height | 1460 mm | 1400 mm |
| Wheelbase Size | 2660 mm | 2660 mm |
| Fuel Consumption Overall | 14.8 L/100km | 16.4 L/100km |
| Fuel Tank Capacity | 70 L | 70 L |
