2003 Infiniti M vs. 2005 Lexus RX
To start off, 2005 Lexus RX is newer by 2 year(s). Which means there will be less support and parts availability for 2003 Infiniti M. In addition, the cost of maintenance, including insurance, on 2003 Infiniti M would be higher. At 4,494 cc (8 cylinders), 2003 Infiniti M is equipped with a bigger engine. In terms of performance, 2003 Infiniti M (340 HP @ 6400 RPM) has 139 more horse power than 2005 Lexus RX. (201 HP @ 5600 RPM). In normal driving conditions, 2003 Infiniti M should accelerate faster than 2005 Lexus RX. With that said, vehicle weight also plays an important factor in acceleration. 2005 Lexus RX weights approximately 163 kg more than 2003 Infiniti M.
Because 2005 Lexus RX is four wheel drive (4WD), it will have significant more traction and grip than 2003 Infiniti M. In wet, icy, snow, or gravel driving conditions, 2005 Lexus RX 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 Infiniti M (451 Nm @ 4000 RPM) has 155 more torque (in Nm) than 2005 Lexus RX. (296 Nm @ 4400 RPM). This means 2003 Infiniti M will have an easier job in driving up hills or pulling heavy equipment than 2005 Lexus RX.
Compare all specifications:
| 2003 Infiniti M | 2005 Lexus RX | |
| Make | Infiniti | Lexus |
| Model | M | RX |
| Year Released | 2003 | 2005 |
| Body Type | Sedan | SUV |
| Engine Position | Front | Front |
| Engine Size | 4494 cc | 2999 cc |
| Engine Cylinders | 8 cylinders | 6 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 340 HP | 201 HP |
| Engine RPM | 6400 RPM | 5600 RPM |
| Torque | 451 Nm | 296 Nm |
| Torque RPM | 4000 RPM | 4400 RPM |
| Engine Bore Size | 93 mm | 87.5 mm |
| Engine Stroke Size | 82.7 mm | 83 mm |
| Engine Compression Ratio | 10.5:1 | 11.0:1 |
| Fuel Type | Gasoline | Gasoline - Premium |
| Drive Type | Rear | 4WD |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 5 doors |
| Vehicle Weight | 1747 kg | 1910 kg |
| Vehicle Length | 5020 mm | 4750 mm |
| Vehicle Width | 1780 mm | 1850 mm |
| Vehicle Height | 1470 mm | 1680 mm |
| Wheelbase Size | 2810 mm | 2730 mm |
| Fuel Tank Capacity | 79 L | 72 L |
