2003 BMW 645 vs. 2005 Mercury Mariner
To start off, 2005 Mercury Mariner is newer by 2 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, 2003 BMW 645 (321 HP @ 6100 RPM) has 168 more horse power than 2005 Mercury Mariner. (153 HP @ 5800 RPM). In normal driving conditions, 2003 BMW 645 should accelerate faster than 2005 Mercury Mariner. With that said, vehicle weight also plays an important factor in acceleration. 2003 BMW 645 weights approximately 316 kg more than 2005 Mercury Mariner. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2005 Mercury Mariner 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, 2005 Mercury Mariner 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, 2003 BMW 645 (450 Nm @ 3600 RPM) has 244 more torque (in Nm) than 2005 Mercury Mariner. (206 Nm @ 4250 RPM). This means 2003 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2005 Mercury Mariner.
Compare all specifications:
| 2003 BMW 645 | 2005 Mercury Mariner | |
| Make | BMW | Mercury |
| Model | 645 | Mariner |
| Year Released | 2003 | 2005 |
| Body Type | Convertible | SUV |
| Engine Position | Front | Front |
| Engine Size | 4398 cc | 2261 cc |
| Engine Cylinders | 8 cylinders | 4 cylinders |
| Engine Type | V | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 321 HP | 153 HP |
| Engine RPM | 6100 RPM | 5800 RPM |
| Torque | 450 Nm | 206 Nm |
| Torque RPM | 3600 RPM | 4250 RPM |
| Engine Bore Size | 92 mm | 87 mm |
| Engine Stroke Size | 82.7 mm | 94 mm |
| 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 | 1579 kg |
| Vehicle Length | 4830 mm | 4430 mm |
| Vehicle Width | 1860 mm | 1790 mm |
| Vehicle Height | 1380 mm | 1730 mm |
| Wheelbase Size | 2790 mm | 2630 mm |
| Fuel Consumption | 8.5 L/100km | 10.2 L/100km |
| Fuel Consumption City | 16.8 L/100km | 11.8 L/100km |
| Fuel Consumption Overall | 11.5 L/100km | 11.2 L/100km |
| Fuel Tank Capacity | 70 L | 62 L |
