2003 BMW 645 vs. 1998 Mercedes-Benz SL
To start off, 2003 BMW 645 is newer by 5 year(s). Which means there will be less support and parts availability for 1998 Mercedes-Benz SL. In addition, the cost of maintenance, including insurance, on 1998 Mercedes-Benz SL would be higher. At 5,987 cc (12 cylinders), 1998 Mercedes-Benz SL is equipped with a bigger engine. In terms of performance, 1998 Mercedes-Benz SL (389 HP @ 5200 RPM) has 79 more horse power than 2003 BMW 645. (310 HP @ 6000 RPM) In normal driving conditions, 1998 Mercedes-Benz SL should accelerate faster than 2003 BMW 645. With that said, vehicle weight also plays an important factor in acceleration. 1998 Mercedes-Benz SL weights approximately 352 kg more than 2003 BMW 645. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Both vehicles are rear wheel drive (RWD) - it offers better handling in dry conditions; in addition, if you are looking to drift, both vehicles do the job better than front wheel drive vehicles. 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, 1998 Mercedes-Benz SL (570 Nm @ 3800 RPM) has 120 more torque (in Nm) than 2003 BMW 645. (450 Nm @ 3600 RPM). This means 1998 Mercedes-Benz SL will have an easier job in driving up hills or pulling heavy equipment than 2003 BMW 645.
Compare all specifications:
| 2003 BMW 645 | 1998 Mercedes-Benz SL | |
| Make | BMW | Mercedes-Benz |
| Model | 645 | SL |
| Year Released | 2003 | 1998 |
| Body Type | Coupe | Convertible |
| Engine Position | Front | Front |
| Engine Size | 4398 cc | 5987 cc |
| Engine Cylinders | 8 cylinders | 12 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 310 HP | 389 HP |
| Engine RPM | 6000 RPM | 5200 RPM |
| Torque | 450 Nm | 570 Nm |
| Torque RPM | 3600 RPM | 3800 RPM |
| Engine Bore Size | 92 mm | 89.1 mm |
| Engine Stroke Size | 82.7 mm | 80.2 mm |
| Engine Compression Ratio | 10.5:1 | 10.0:1 |
| Acceleration 0-100mph | 5.9 seconds | 5.1 seconds |
| Drive Type | Rear | Rear |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 4 seats | 2 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1698 kg | 2050 kg |
| Vehicle Length | 4830 mm | 4510 mm |
| Vehicle Width | 1860 mm | 1820 mm |
| Vehicle Height | 1380 mm | 1300 mm |
| Wheelbase Size | 2790 mm | 2410 mm |
| Fuel Tank Capacity | 70 L | 80 L |
