Clearing the Air.

The Super Duty?s new 6.4-liter Powerstroke engine even offers increased power and torque making it the most popular choice for over 8,500 pound trucks, but these newer engines will require some special attention. North America is on the cusp of a clean-diesel revolution, driven by the Environmental Protection Agency?s (EPA) mandated move to ultra-low sulfur diesel, which was launched Oct. 15.