In almost 25 years powering General Motors trucks and SUVs, the 6.6-liter Duramax V8 diesel engine has earned a loyal ...

A U.S. EPA official says the agency’s proposal to end Diesel Exhaust Fluid system deratements would be a win for farmers and truckers. Aaron Szabo is the assistant administrator of the EPA’s Office of ...

Truck drivers have received relief from DEF-induced headaches from the Environmental Protection Agency over the past year. But what happens if a new administration comes in and reverses everything?

The U.S. House Subcommittee on Environment advanced legislation on July 14 that sponsors said will reduce engine shutdowns caused by diesel exhaust fluid (DEF) sensors. “The DEF Act provides a vital, ...

EPA is proposing to eliminate DEF-related engine derates and replace them with dashboard alerts, a move aimed at reducing downtime and keeping trucks operating. The change is part of the Trump ...

Add Yahoo as a preferred source to see more of our stories on Google. Image Credit: Shutterstock. The Environmental Protection Agency wants to change how diesel trucks respond when their emissions ...

The EPA just released its biggest proposal yet to rewrite the 2027 heavy-duty diesel emissions rules, and it answers the question diesel owners have been asking for months. Will DEF systems disappear?

The Environmental Protection Agency (EPA) on Thursday published a proposal to revise regulations for commercial truck nitrogen oxides (NOx) emissions for the 2027 model year, dropping a requirement ...

After a year and a half, EPA's regulatory rollback for MY 2027 diesel engines' NOx emissions was finally unveiled as a proposed rulemaking. The relaxed NOx standard removes warranty extensions and ...

[This story originally appeared in the September 2004 issue of MotorTrend with the headline "Moving Mountains."] Sometime during the night of September 29, 1913, Rudolph Diesel, 55 years old, roughly ...

Cummins is rolling out updated engine calibrations that give truck operators more time to address diesel exhaust fluid (DEF) system issues before engine derates occur, following revised guidance from ...