2005 Buick Regal vs. 2006 Cadillac STS
To start off, 2006 Cadillac STS is newer by 1 year(s). Which means there will be less support and parts availability for 2005 Buick Regal. In addition, the cost of maintenance, including insurance, on 2005 Buick Regal would be higher. At 3,791 cc (6 cylinders), 2005 Buick Regal is equipped with a bigger engine. In terms of performance, 2006 Cadillac STS (253 HP @ 6500 RPM) has 56 more horse power than 2005 Buick Regal. (197 HP @ 5200 RPM) In normal driving conditions, 2006 Cadillac STS should accelerate faster than 2005 Buick Regal. With that said, vehicle weight also plays an important factor in acceleration. 2006 Cadillac STS weights approximately 222 kg more than 2005 Buick Regal. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2006 Cadillac STS is rear wheel drive (RWD), it offers better handling in dry conditions; in addition, if you are looking to drift, it will be much easier to do with 2006 Cadillac STS. However, in wet, icy, snow, or gravel driving conditions, 2005 Buick Regal, being front wheel drive (FWD), will offer much better control with better grip. 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, 2006 Cadillac STS (342 Nm @ 3200 RPM) has 31 more torque (in Nm) than 2005 Buick Regal. (311 Nm @ 4000 RPM). This means 2006 Cadillac STS will have an easier job in driving up hills or pulling heavy equipment than 2005 Buick Regal.
Compare all specifications:
| 2005 Buick Regal | 2006 Cadillac STS | |
| Make | Buick | Cadillac |
| Model | Regal | STS |
| Year Released | 2005 | 2006 |
| Body Type | Sedan | Sedan |
| Engine Position | Front | Front |
| Engine Size | 3791 cc | 3563 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 2 valves | 4 valves |
| Horse Power | 197 HP | 253 HP |
| Engine RPM | 5200 RPM | 6500 RPM |
| Torque | 311 Nm | 342 Nm |
| Torque RPM | 4000 RPM | 3200 RPM |
| Engine Bore Size | 97 mm | 94 mm |
| Engine Stroke Size | 86 mm | 85.6 mm |
| Engine Compression Ratio | 9.4:1 | 10.2:1 |
| Fuel Type | Gasoline | Gasoline - Premium |
| Drive Type | Front | Rear |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 4 doors |
| Vehicle Weight | 1560 kg | 1782 kg |
| Vehicle Length | 4990 mm | 4990 mm |
| Vehicle Width | 1850 mm | 1850 mm |
| Vehicle Height | 1440 mm | 1470 mm |
| Wheelbase Size | 2780 mm | 2960 mm |
| Fuel Tank Capacity | 64 L | 66 L |
