2007 Audi S4 vs. 1991 BMW 525
To start off, 2007 Audi S4 is newer by 16 year(s). Which means there will be less support and parts availability for 1991 BMW 525. In addition, the cost of maintenance, including insurance, on 1991 BMW 525 would be higher. At 4,163 cc (8 cylinders), 2007 Audi S4 is equipped with a bigger engine. In terms of performance, 2007 Audi S4 (340 HP @ 7000 RPM) has 197 more horse power than 1991 BMW 525. (143 HP @ 4800 RPM). In normal driving conditions, 2007 Audi S4 should accelerate faster than 1991 BMW 525. With that said, vehicle weight also plays an important factor in acceleration. 1991 BMW 525 weights approximately 30 kg more than 2007 Audi S4.
Because 2007 Audi S4 is four wheel drive (4WD), it will have significant more traction and grip than 1991 BMW 525. In wet, icy, snow, or gravel driving conditions, 2007 Audi S4 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, 2007 Audi S4 (410 Nm @ 3500 RPM) has 150 more torque (in Nm) than 1991 BMW 525. (260 Nm @ 2200 RPM). This means 2007 Audi S4 will have an easier job in driving up hills or pulling heavy equipment than 1991 BMW 525.
Compare all specifications:
| 2007 Audi S4 | 1991 BMW 525 | |
| Make | Audi | BMW |
| Model | S4 | 525 |
| Year Released | 2007 | 1991 |
| Body Type | Sedan | Station Wagon |
| Engine Position | Front | Front |
| Engine Size | 4163 cc | 2496 cc |
| Engine Cylinders | 8 cylinders | 6 cylinders |
| Engine Type | V | in-line |
| Horse Power | 340 HP | 143 HP |
| Engine RPM | 7000 RPM | 4800 RPM |
| Torque | 410 Nm | 260 Nm |
| Torque RPM | 3500 RPM | 2200 RPM |
| Engine Bore Size | 84.5 mm | 80 mm |
| Engine Stroke Size | 93 mm | 83 mm |
| Engine Compression Ratio | 11.0:1 | 22.0:1 |
| Fuel Type | Diesel | Diesel |
| Drive Type | 4WD | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 5 doors |
| Vehicle Weight | 1530 kg | 1560 kg |
| Vehicle Length | 4590 mm | 4730 mm |
| Vehicle Width | 1790 mm | 1760 mm |
| Vehicle Height | 1420 mm | 1420 mm |
| Wheelbase Size | 2660 mm | 2770 mm |
| Fuel Tank Capacity | 63 L | 80 L |
