2007 BMW X3 vs. 1991 BMW 525
To start off, 2007 BMW X3 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 2,993 cc (6 cylinders), 2007 BMW X3 is equipped with a bigger engine. In terms of performance, 2007 BMW X3 (283 HP @ 4400 RPM) has 140 more horse power than 1991 BMW 525. (143 HP @ 4800 RPM). In normal driving conditions, 2007 BMW X3 should accelerate faster than 1991 BMW 525. With that said, vehicle weight also plays an important factor in acceleration. 2007 BMW X3 weights approximately 390 kg more than 1991 BMW 525. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2007 BMW X3 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 BMW X3 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 BMW X3 (580 Nm @ 1750 RPM) has 320 more torque (in Nm) than 1991 BMW 525. (260 Nm @ 2200 RPM). This means 2007 BMW X3 will have an easier job in driving up hills or pulling heavy equipment than 1991 BMW 525. 2007 BMW X3 has automatic transmission and 1991 BMW 525 has manual transmission. 1991 BMW 525 will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2007 BMW X3 will be easier to drive especially in heavy traffic.
Compare all specifications:
| 2007 BMW X3 | 1991 BMW 525 | |
| Make | BMW | BMW |
| Model | X3 | 525 |
| Year Released | 2007 | 1991 |
| Body Type | SUV | Station Wagon |
| Engine Position | Front | Front |
| Engine Size | 2993 cc | 2496 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | in-line | in-line |
| Horse Power | 283 HP | 143 HP |
| Engine RPM | 4400 RPM | 4800 RPM |
| Torque | 580 Nm | 260 Nm |
| Torque RPM | 1750 RPM | 2200 RPM |
| Engine Bore Size | 84 mm | 80 mm |
| Engine Stroke Size | 88 mm | 83 mm |
| Engine Compression Ratio | 17.0:1 | 22.0:1 |
| Fuel Type | Diesel | Diesel |
| Top Speed | 240 km/hour | 199 km/hour |
| Acceleration 0-100mph | 6.6 seconds | 11.6 seconds |
| Drive Type | 4WD | Rear |
| Transmission Type | Automatic | Manual |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 5 doors | 5 doors |
| Vehicle Weight | 1950 kg | 1560 kg |
| Vehicle Length | 4570 mm | 4730 mm |
| Vehicle Width | 1860 mm | 1760 mm |
| Vehicle Height | 1680 mm | 1420 mm |
| Wheelbase Size | 2800 mm | 2770 mm |
| Fuel Tank Capacity | 67 L | 80 L |
