2009 BMW X3 vs. 1981 BMW 725
To start off, 2009 BMW X3 is newer by 28 year(s). Which means there will be less support and parts availability for 1981 BMW 725. In addition, the cost of maintenance, including insurance, on 1981 BMW 725 would be higher. At 2,493 cc (6 cylinders), 1981 BMW 725 is equipped with a bigger engine. In terms of performance, both vehicles can yield 148 horse power. So under normal driving conditions, the acceleration of both vehicles should be relatively similar.
Because 2009 BMW X3 is four wheel drive (4WD), it will have significant more traction and grip than 1981 BMW 725. In wet, icy, snow, or gravel driving conditions, 2009 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, 1981 BMW 725 (215 Nm @ 4000 RPM) has 15 more torque (in Nm) than 2009 BMW X3. (200 Nm @ 3750 RPM). This means 1981 BMW 725 will have an easier job in driving up hills or pulling heavy equipment than 2009 BMW X3.
Compare all specifications:
| 2009 BMW X3 | 1981 BMW 725 | |
| Make | BMW | BMW |
| Model | X3 | 725 |
| Year Released | 2009 | 1981 |
| Body Type | SUV | Sedan |
| Engine Position | Front | Front |
| Engine Size | 1995 cc | 2493 cc |
| Engine Cylinders | 4 cylinders | 6 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 4 valves | 2 valves |
| Horse Power | 148 HP | 148 HP |
| Engine RPM | 6200 RPM | 5500 RPM |
| Torque | 200 Nm | 215 Nm |
| Torque RPM | 3750 RPM | 4000 RPM |
| Engine Bore Size | 84 mm | 86 mm |
| Engine Stroke Size | 90 mm | 71.6 mm |
| Engine Compression Ratio | 10.5:1 | 9.6:1 |
| Fuel Type | Gasoline - Premium | Gasoline |
| Drive Type | 4WD | Rear |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 5 doors | 4 doors |
| Vehicle Length | 4570 mm | 4870 mm |
| Vehicle Width | 1860 mm | 1810 mm |
| Vehicle Height | 1680 mm | 1440 mm |
| Wheelbase Size | 2800 mm | 2810 mm |
