2008 Audi A6 vs. 2003 BMW 645
To start off, 2008 Audi A6 is newer by 5 year(s). Which means there will be less support and parts availability for 2003 BMW 645. In addition, the cost of maintenance, including insurance, on 2003 BMW 645 would be higher. At 4,398 cc (8 cylinders), 2003 BMW 645 is equipped with a bigger engine. With that said, vehicle weight also plays an important factor in acceleration. 2003 BMW 645 weights approximately 235 kg more than 2008 Audi A6.
Because 2008 Audi A6 is four wheel drive (4WD), it will have significant more traction and grip than 2003 BMW 645. In wet, icy, snow, or gravel driving conditions, 2008 Audi A6 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, 2003 BMW 645 (450 Nm @ 3600 RPM) has 100 more torque (in Nm) than 2008 Audi A6. (350 Nm @ 1800 RPM). This means 2003 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2008 Audi A6.
Compare all specifications:
| 2008 Audi A6 | 2003 BMW 645 | |
| Make | Audi | BMW |
| Model | A6 | 645 |
| Year Released | 2008 | 2003 |
| Body Type | Sedan | Convertible |
| Engine Position | Front | Front |
| Engine Size | 2671 cc | 4398 cc |
| Valves per Cylinder | 5 valves | 4 valves |
| Horse Power | 0 HP | 321 HP |
| Torque | 350 Nm | 450 Nm |
| Torque RPM | 1800 RPM | 3600 RPM |
| Engine Compression Ratio | 9.3:1 | 10.5:1 |
| Top Speed | 243 km/hour | 250 km/hour |
| Acceleration 0-100mph | 6.8 seconds | 6.2 seconds |
| Drive Type | 4WD | Rear |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Weight | 1660 kg | 1895 kg |
| Vehicle Length | 4820 mm | 4830 mm |
| Vehicle Width | 1860 mm | 1860 mm |
| Vehicle Height | 1470 mm | 1380 mm |
| Wheelbase Size | 2770 mm | 2790 mm |
| Fuel Consumption Overall | 11.7 L/100km | 11.5 L/100km |
| Fuel Tank Capacity | 70 L | 70 L |
