1999 Audi S8 vs. 2008 BMW 645
To start off, 2008 BMW 645 is newer by 9 year(s). Which means there will be less support and parts availability for 1999 Audi S8. In addition, the cost of maintenance, including insurance, on 1999 Audi S8 would be higher. At 4,398 cc (8 cylinders), 2008 BMW 645 is equipped with a bigger engine. In terms of performance, 2008 BMW 645 (328 HP @ 6100 RPM) has 81 more horse power than 1999 Audi S8. (247 HP @ 7000 RPM) In normal driving conditions, 2008 BMW 645 should accelerate faster than 1999 Audi S8. With that said, vehicle weight also plays an important factor in acceleration. 1999 Audi S8 weights approximately 60 kg more than 2008 BMW 645.
Because 1999 Audi S8 is all wheel drive (AWD), it will have significant more traction and grip than 2008 BMW 645. In wet, icy, snow, or gravel driving conditions, 1999 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, 2008 BMW 645 (450 Nm @ 3600 RPM) has 120 more torque (in Nm) than 1999 Audi S8. (330 Nm @ 3400 RPM). This means 2008 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 1999 Audi S8. 1999 Audi S8 has automatic transmission and 2008 BMW 645 has manual transmission. 2008 BMW 645 will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 1999 Audi S8 will be easier to drive especially in heavy traffic.
Compare all specifications:
| 1999 Audi S8 | 2008 BMW 645 | |
| Make | Audi | BMW |
| Model | S8 | 645 |
| Year Released | 1999 | 2008 |
| Body Type | Sedan | Coupe |
| Engine Position | Front | Front |
| Engine Size | 4170 cc | 4398 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 247 HP | 328 HP |
| Engine RPM | 7000 RPM | 6100 RPM |
| Torque | 330 Nm | 450 Nm |
| Torque RPM | 3400 RPM | 3600 RPM |
| Engine Bore Size | 84.5 mm | 92.1 mm |
| Engine Stroke Size | 93 mm | 82.7 mm |
| Engine Compression Ratio | 11.0:1 | 10.0:1 |
| Acceleration 0-100mph | 6.6 seconds | 5.6 seconds |
| Drive Type | AWD | Rear |
| Transmission Type | Automatic | Manual |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Weight | 1750 kg | 1690 kg |
| Vehicle Length | 5040 mm | 4830 mm |
| Vehicle Width | 1890 mm | 1860 mm |
| Vehicle Height | 1420 mm | 1380 mm |
| Wheelbase Size | 2890 mm | 2790 mm |
| Fuel Consumption Overall | 13.9 L/100km | 11.8 L/100km |
| Fuel Tank Capacity | 90 L | 70 L |
