1991 Buick Roadmaster vs. 2013 BMW 6 series
To start off, 2013 BMW 6 series is newer by 22 year(s). Which means there will be less support and parts availability for 1991 Buick Roadmaster. In addition, the cost of maintenance, including insurance, on 1991 Buick Roadmaster would be higher. At 5,731 cc (8 cylinders), 1991 Buick Roadmaster is equipped with a bigger engine. In terms of performance, 2013 BMW 6 series (311 HP @ 6000 RPM) has 134 more horse power than 1991 Buick Roadmaster. (177 HP @ 4200 RPM) In normal driving conditions, 2013 BMW 6 series should accelerate faster than 1991 Buick Roadmaster. With that said, vehicle weight also plays an important factor in acceleration. 1991 Buick Roadmaster weights approximately 25 kg more than 2013 BMW 6 series.
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, 2013 BMW 6 series (447 Nm @ 4500 RPM) has 54 more torque (in Nm) than 1991 Buick Roadmaster. (393 Nm @ 2400 RPM). This means 2013 BMW 6 series will have an easier job in driving up hills or pulling heavy equipment than 1991 Buick Roadmaster.
Compare all specifications:
| 1991 Buick Roadmaster | 2013 BMW 6 series | |
| Make | Buick | BMW |
| Model | Roadmaster | 6 series |
| Year Released | 1991 | 2013 |
| Body Type | Sedan | Coupe |
| Engine Position | Front | Front |
| Engine Size | 5731 cc | 2979 cc |
| Engine Cylinders | 8 cylinders | 6 cylinders |
| Engine Type | V | in-line |
| Horse Power | 177 HP | 311 HP |
| Engine RPM | 4200 RPM | 6000 RPM |
| Torque | 393 Nm | 447 Nm |
| Torque RPM | 2400 RPM | 4500 RPM |
| Engine Compression Ratio | 8.0:1 | 10.2 :1 |
| Fuel Type | Gasoline | Gasoline |
| Drive Type | Rear | Rear |
| Transmission Type | Automatic | 8-speed automatic |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Weight | 1840 kg | 1815 kg |
| Vehicle Length | 5280 mm | 4897 mm |
| Vehicle Width | 2040 mm | 1895 mm |
| Vehicle Height | 1650 mm | 1369 mm |
| Wheelbase Size | 2950 mm | 2856 mm |
| Fuel Tank Capacity | 75 L | 70 L |
