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Daimler Truck executives signaled a renewed focus on diesel powertrains at the company’s Capital Market Day 2025.

DOC and SCR system failures are taking trucks off the road without warning. This resource breaks down how these components fail, why it matters to your fleet’s performance, and what steps you can take to reduce downtime, avoid fines, and stay ahead of issues.

A Texas-based startup is promising 40% fuel efficiency savings and reductions in carbon emissions from a hybrid diesel-electric Class 8 tractor set to be unveiled at the end of March.

Legislation updating the Diesel Emissions Reduction Act was recently passed in the U.S. Senate.

Volkswagen AG lost another lawsuit in a German court over its software fix for engines in the wake of the diesel scandal that tarnished the reputation of Europe’s biggest carmaker.

Legislation that aims to block efforts to prevent the sale of internal combustion engines was recently introduced in the Senate.

Eleven people have been charged in Michigan in a scheme to evade air-pollution rules by tampering with software and hardware in heavy-duty diesel engines, federal authorities said April 26.

The Environmental Protection Agency's Clean Trucks Plan, to take effect by 2027, is targeting a 75% reduction in nitrogen oxide.

While truck manufacturers make advances in battery electric and hydrogen fuel cell technology, they also are making fuel efficiency and aerodynamic improvements to their diesel offerings that will form the backbone of the trucking industry for years to come.

Adjusting overhead valves on heavy-duty ­diesels is a routine maintenance item subject to benign neglect in many of today’s fleets. But factory engineers are split on the importance of frequently setting overheads.