2008 Audi A6 vs. 2004 BMW 645
To start off, 2008 Audi A6 is newer by 4 year(s). Which means there will be less support and parts availability for 2004 BMW 645. In addition, the cost of maintenance, including insurance, on 2004 BMW 645 would be higher. At 4,392 cc (8 cylinders), 2004 BMW 645 is equipped with a bigger engine. In terms of performance, 2004 BMW 645 (322 HP @ 7400 RPM) has 74 more horse power than 2008 Audi A6. (248 HP @ 5800 RPM) In normal driving conditions, 2004 BMW 645 should accelerate faster than 2008 Audi A6. With that said, vehicle weight also plays an important factor in acceleration. 2008 Audi A6 weights approximately 5 kg more than 2004 BMW 645.
Because 2008 Audi A6 is four wheel drive (4WD), it will have significant more traction and grip than 2004 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, 2004 BMW 645 (447 Nm) has 97 more torque (in Nm) than 2008 Audi A6. (350 Nm). This means 2004 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 | 2004 BMW 645 | |
| Make | Audi | BMW |
| Model | A6 | 645 |
| Year Released | 2008 | 2004 |
| Body Type | Station Wagon | Coupe |
| Engine Position | Front | Front |
| Engine Size | 2671 cc | 4392 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 5 valves | 4 valves |
| Horse Power | 248 HP | 322 HP |
| Engine RPM | 5800 RPM | 7400 RPM |
| Torque | 350 Nm | 447 Nm |
| Engine Bore Size | 81 mm | 92 mm |
| Engine Stroke Size | 86.4 mm | 83 mm |
| Engine Compression Ratio | 9.0:1 | 10.5:1 |
| Drive Type | 4WD | Rear |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 5 doors | 2 doors |
| Vehicle Weight | 1720 kg | 1715 kg |
| Vehicle Length | 4800 mm | 4840 mm |
| Vehicle Width | 1820 mm | 1860 mm |
| Vehicle Height | 1460 mm | 1380 mm |
| Wheelbase Size | 2770 mm | 2790 mm |
| Fuel Consumption Overall | 11.8 L/100km | 11.8 L/100km |
| Fuel Tank Capacity | 70 L | 70 L |
