Diesel engines can be more efficient than gasoline engines, but that's largely due to DEF. Here's what it does, how it helps, and what happens if you run out.

In an effort to help educate and hopefully ease some fears, Kaeser's white paper "Tier 4 Final Engines: Considerations for Fuel, DEF, Exhaust After-Treatment, and Regeneration" provides some basic ...

DEF is used to reduce harmful nitrogen oxide (NOx) emissions from diesel engines. (Photo: iStock) Under EPA’s new guidance for heavy-duty trucks, after a fault is detected, only a warning light will ...

Engine, Truck Manufacturers Support EPA Easing Derate of SCR Diesel Emissions Controls School Transportation News News ...