2003 BMW 645 vs. 2009 Infiniti M
To start off, 2009 Infiniti M is newer by 6 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 4,493 cc (8 cylinders), 2009 Infiniti M is equipped with a bigger engine. In terms of performance, both vehicles can yield 325 horse power. So under normal driving conditions, the acceleration of both vehicles should be relatively similar. With that said, vehicle weight also plays an important factor in acceleration. 2009 Infiniti M weights approximately 29 kg more than 2003 BMW 645.
Because 2009 Infiniti M 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, 2009 Infiniti M 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, 2009 Infiniti M (456 Nm @ 4000 RPM) has 6 more torque (in Nm) than 2003 BMW 645. (450 Nm @ 3600 RPM). This means 2009 Infiniti M will have an easier job in driving up hills or pulling heavy equipment than 2003 BMW 645. 2009 Infiniti M has automatic transmission and 2003 BMW 645 has manual transmission. 2003 BMW 645 will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2009 Infiniti M will be easier to drive especially in heavy traffic.
Compare all specifications:
| 2003 BMW 645 | 2009 Infiniti M | |
| Make | BMW | Infiniti |
| Model | 645 | M |
| Year Released | 2003 | 2009 |
| Body Type | Coupe | Sedan |
| Engine Position | Front | Front |
| Engine Size | 4398 cc | 4493 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 325 HP | 325 HP |
| Engine RPM | 6100 RPM | 6400 RPM |
| Torque | 450 Nm | 456 Nm |
| Torque RPM | 3600 RPM | 4000 RPM |
| Engine Compression Ratio | 10.5:1 | 10.5:1 |
| Drive Type | Rear | 4WD |
| Transmission Type | Manual | Automatic |
| Number of Seats | 4 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 1690 kg | 1719 kg |
| Vehicle Length | 4830 mm | 4940 mm |
| Vehicle Width | 1860 mm | 1810 mm |
| Vehicle Height | 1380 mm | 1530 mm |
| Wheelbase Size | 2890 mm | 2910 mm |
| Fuel Consumption | 8.6 L/100km | 11.8 L/100km |
| Fuel Consumption City | 17.2 L/100km | 16.8 L/100km |
| Fuel Consumption Overall | 11.7 L/100km | 14.7 L/100km |
| Fuel Tank Capacity | 70 L | 76 L |
