2004 Audi A6 vs. 1978 BMW 725
To start off, 2004 Audi A6 is newer by 26 year(s). Which means there will be less support and parts availability for 1978 BMW 725. In addition, the cost of maintenance, including insurance, on 1978 BMW 725 would be higher. At 2,495 cc (6 cylinders), 1978 BMW 725 is equipped with a bigger engine. In terms of performance, 2004 Audi A6 (178 HP @ 4000 RPM) has 30 more horse power than 1978 BMW 725. (148 HP @ 5500 RPM). In normal driving conditions, 2004 Audi A6 should accelerate faster than 1978 BMW 725.
Because 2004 Audi A6 is four wheel drive (4WD), it will have significant more traction and grip than 1978 BMW 725. In wet, icy, snow, or gravel driving conditions, 2004 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 Audi A6 (370 Nm @ 1500 RPM) has 155 more torque (in Nm) than 1978 BMW 725. (215 Nm @ 4000 RPM). This means 2004 Audi A6 will have an easier job in driving up hills or pulling heavy equipment than 1978 BMW 725.
Compare all specifications:
| 2004 Audi A6 | 1978 BMW 725 | |
| Make | Audi | BMW |
| Model | A6 | 725 |
| Year Released | 2004 | 1978 |
| Body Type | Station Wagon | Sedan |
| Engine Position | Front | Front |
| Engine Size | 2393 cc | 2495 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | V | in-line |
| Valves per Cylinder | 4 valves | 2 valves |
| Horse Power | 178 HP | 148 HP |
| Engine RPM | 4000 RPM | 5500 RPM |
| Torque | 370 Nm | 215 Nm |
| Torque RPM | 1500 RPM | 4000 RPM |
| Engine Bore Size | 78.3 mm | 86.1 mm |
| Engine Stroke Size | 86.4 mm | 71.6 mm |
| Engine Compression Ratio | 19.0:1 | 9.6:1 |
| Fuel Type | Diesel | Gasoline |
| Drive Type | 4WD | Rear |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 5 doors | 4 doors |
| Vehicle Length | 4800 mm | 4870 mm |
| Vehicle Width | 1820 mm | 1810 mm |
| Vehicle Height | 1460 mm | 1440 mm |
| Wheelbase Size | 2890 mm | 2810 mm |
