2003 BMW 645 vs. 2008 Cadillac STS
To start off, 2008 Cadillac STS is newer by 5 year(s). Which means there will be less support and parts availability for 2003 BMW 645. In addition, the cost of maintenance, including insurance, on 2003 BMW 645 would be higher. At 4,398 cc (8 cylinders), 2003 BMW 645 is equipped with a bigger engine. In terms of performance, 2008 Cadillac STS (469 HP @ 6400 RPM) has 148 more horse power than 2003 BMW 645. (321 HP @ 6100 RPM) In normal driving conditions, 2008 Cadillac STS should accelerate faster than 2003 BMW 645. With that said, vehicle weight also plays an important factor in acceleration. 2003 BMW 645 weights approximately 335 kg more than 2008 Cadillac STS.
Because 2008 Cadillac STS is four wheel drive (4WD), it will have significant more traction and grip than 2003 BMW 645. In wet, icy, snow, or gravel driving conditions, 2008 Cadillac STS 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, 2008 Cadillac STS (595 Nm @ 3900 RPM) has 145 more torque (in Nm) than 2003 BMW 645. (450 Nm @ 3600 RPM). This means 2008 Cadillac STS will have an easier job in driving up hills or pulling heavy equipment than 2003 BMW 645.
Compare all specifications:
| 2003 BMW 645 | 2008 Cadillac STS | |
| Make | BMW | Cadillac |
| Model | 645 | STS |
| Year Released | 2003 | 2008 |
| Body Type | Convertible | Sedan |
| Engine Position | Front | Front |
| Engine Size | 4398 cc | 4376 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 321 HP | 469 HP |
| Engine RPM | 6100 RPM | 6400 RPM |
| Torque | 450 Nm | 595 Nm |
| Torque RPM | 3600 RPM | 3900 RPM |
| Drive Type | Rear | 4WD |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 4 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 1895 kg | 1560 kg |
| Vehicle Length | 4830 mm | 5030 mm |
| Vehicle Width | 1860 mm | 1850 mm |
| Vehicle Height | 1380 mm | 1480 mm |
| Wheelbase Size | 2790 mm | 2960 mm |
| Fuel Consumption | 8.5 L/100km | 12.4 L/100km |
| Fuel Consumption City | 16.8 L/100km | 18.1 L/100km |
| Fuel Consumption Overall | 11.5 L/100km | 15.7 L/100km |
| Fuel Tank Capacity | 70 L | 64 L |
