2004 BMW X3 vs. 1978 BMW 725
To start off, 2004 BMW X3 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 BMW X3 (184 HP @ 7400 RPM) has 36 more horse power than 1978 BMW 725. (148 HP @ 5500 RPM). In normal driving conditions, 2004 BMW X3 should accelerate faster than 1978 BMW 725.
Because 2004 BMW X3 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 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, 2004 BMW X3 (237 Nm) has 22 more torque (in Nm) than 1978 BMW 725. (215 Nm). This means 2004 BMW X3 will have an easier job in driving up hills or pulling heavy equipment than 1978 BMW 725.
Compare all specifications:
| 2004 BMW X3 | 1978 BMW 725 | |
| Make | BMW | BMW |
| Model | X3 | 725 |
| Year Released | 2004 | 1978 |
| Body Type | SUV | Sedan |
| Engine Position | Front | Front |
| Engine Size | 2491 cc | 2495 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 4 valves | 2 valves |
| Horse Power | 184 HP | 148 HP |
| Engine RPM | 7400 RPM | 5500 RPM |
| Torque | 237 Nm | 215 Nm |
| Engine Bore Size | 84 mm | 86.1 mm |
| Engine Stroke Size | 75 mm | 71.6 mm |
| Engine Compression Ratio | 10.5:1 | 9.6:1 |
| 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 | 2890 mm | 2810 mm |
