2008 Audi A4 vs. 2004 BMW 645
To start off, 2008 Audi A4 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 4,398 cc (8 cylinders), 2004 BMW 645 is equipped with a bigger engine. In terms of performance, 2004 BMW 645 (328 HP @ 6100 RPM) has 214 more horse power than 2008 Audi A4. (114 HP @ 4000 RPM) In normal driving conditions, 2004 BMW 645 should accelerate faster than 2008 Audi A4. With that said, vehicle weight also plays an important factor in acceleration. 2004 BMW 645 weights approximately 415 kg more than 2008 Audi A4. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2008 Audi A4 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 A4 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 (450 Nm @ 3600 RPM) has 165 more torque (in Nm) than 2008 Audi A4. (285 Nm @ 1900 RPM). This means 2004 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2008 Audi A4. 2004 BMW 645 has automatic transmission and 2008 Audi A4 has manual transmission. 2008 Audi A4 will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2004 BMW 645 will be easier to drive especially in heavy traffic.
Compare all specifications:
| 2008 Audi A4 | 2004 BMW 645 | |
| Make | Audi | BMW |
| Model | A4 | 645 |
| Year Released | 2008 | 2004 |
| Body Type | Station Wagon | Coupe |
| Engine Position | Front | Front |
| Engine Size | 1896 cc | 4398 cc |
| Engine Cylinders | 4 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 2 valves | 4 valves |
| Horse Power | 114 HP | 328 HP |
| Engine RPM | 4000 RPM | 6100 RPM |
| Torque | 285 Nm | 450 Nm |
| Torque RPM | 1900 RPM | 3600 RPM |
| Engine Bore Size | 79.6 mm | 92 mm |
| Engine Stroke Size | 95.5 mm | 82.7 mm |
| Engine Compression Ratio | 19.0:1 | 10.0:1 |
| Fuel Type | Diesel | Gasoline - Premium |
| Acceleration 0-100mph | 10.6 seconds | 5.6 seconds |
| Drive Type | 4WD | Rear |
| Transmission Type | Manual | Automatic |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 5 doors | 2 doors |
| Vehicle Weight | 1275 kg | 1690 kg |
| Vehicle Length | 4550 mm | 4830 mm |
| Vehicle Width | 1780 mm | 1860 mm |
| Vehicle Height | 1430 mm | 1380 mm |
| Wheelbase Size | 2660 mm | 2830 mm |
| Fuel Consumption Overall | 6.1 L/100km | 12 L/100km |
| Fuel Tank Capacity | 70 L | 70 L |
