* 4.7L PowerTech V8: This was the standard engine, offering 235 horsepower and 305 lb-ft of torque.
* 5.7L Hemi V8: This was an optional engine, providing 335 horsepower and 375 lb-ft of torque.
There was also a 4.7L V8 with MDS (Multi-Displacement System) option, which could switch between 8 cylinders and 4 cylinders for better fuel economy. This engine produced 235 horsepower and 305 lb-ft of torque.
It's important to note that the specific engine in a 2006 Dodge Durango depends on the trim level and options chosen by the original owner. If you want to know the exact engine size for a particular 2006 Durango, you can look up the Vehicle Identification Number (VIN) online or consult the vehicle's owner's manual.