2009 Audi A4 vs. 1981 BMW 525
To start off, 2009 Audi A4 is newer by 28 year(s). Which means there will be less support and parts availability for 1981 BMW 525. In addition, the cost of maintenance, including insurance, on 1981 BMW 525 would be higher. At 2,495 cc (6 cylinders), 1981 BMW 525 is equipped with a bigger engine. In terms of performance, 1981 BMW 525 (148 HP @ 5500 RPM) has 49 more horse power than 2009 Audi A4. (99 HP @ 4000 RPM) In normal driving conditions, 1981 BMW 525 should accelerate faster than 2009 Audi A4. With that said, vehicle weight also plays an important factor in acceleration. 2009 Audi A4 weights approximately 150 kg more than 1981 BMW 525.
Because 1981 BMW 525 is rear wheel drive (RWD), it offers better handling in dry conditions; in addition, if you are looking to drift, it will be much easier to do with 1981 BMW 525. However, in wet, icy, snow, or gravel driving conditions, 2009 Audi A4, being front wheel drive (FWD), will offer much better control with better grip. 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, 2009 Audi A4 (250 Nm @ 1900 RPM) has 35 more torque (in Nm) than 1981 BMW 525. (215 Nm @ 4000 RPM). This means 2009 Audi A4 will have an easier job in driving up hills or pulling heavy equipment than 1981 BMW 525.
Compare all specifications:
| 2009 Audi A4 | 1981 BMW 525 | |
| Make | Audi | BMW |
| Model | A4 | 525 |
| Year Released | 2009 | 1981 |
| Body Type | Station Wagon | Sedan |
| Engine Position | Front | Front |
| Engine Size | 1896 cc | 2495 cc |
| Engine Cylinders | 4 cylinders | 6 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 2 valves | 2 valves |
| Horse Power | 99 HP | 148 HP |
| Engine RPM | 4000 RPM | 5500 RPM |
| Torque | 250 Nm | 215 Nm |
| Torque RPM | 1900 RPM | 4000 RPM |
| Engine Bore Size | 79.5 mm | 86.1 mm |
| Engine Stroke Size | 95.5 mm | 71.6 mm |
| Engine Compression Ratio | 19.0:1 | 9.6:1 |
| Acceleration 0-100mph | 12.8 seconds | 8.6 seconds |
| Drive Type | Front | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 5 doors | 4 doors |
| Vehicle Weight | 1430 kg | 1280 kg |
| Vehicle Length | 4550 mm | 4780 mm |
| Vehicle Width | 1780 mm | 1810 mm |
| Vehicle Height | 1430 mm | 1440 mm |
| Wheelbase Size | 2660 mm | 2630 mm |
| Fuel Consumption Overall | 5.4 L/100km | 9.4 L/100km |
| Fuel Tank Capacity | 70 L | 70 L |
