The 6.6 Duramax and 6.7 Power Stroke are two engines powering some of the most well-known pickups in the country, but how do ...

While many aspects of the 6.6-liter Duramax diesel are highly praised, many owners have experienced trouble with the fuel pump and EGR system. These issues have occurred across the GMC Sierra ...

In addition to the diesel fuel (which could also be biodiesel), the ethanol used in CleanFlex is cut to 60 percent with water (called EM60). You can hear Dickey talk about the system over at ...