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Graphic asking whether the EPA will eliminate DEF-related engine deratements, featuring a DEF fuel sign, a federal government building, and bold headline text highlighting potential changes to diesel emissions regulations.

News•News/Media Release•July 13, 2026

EPA Proposing Plan to Save Truckers $12 Billion by Revising Biden-Era Rule & Eliminating DEF Deratements

A U.S. Environmental Protection Agency proposal seeks to revise emissions compliance requirements enacted under the previous administration and eliminate DEF-related deratements completely. The public comment period is open now.

News•News/Media Release•June 19, 2026

DTNA to Equip Vehicles with Updated DEF Inducement Software

Daimler Truck North America is equipping its Detroit engines with updated software reflecting the U.S. Environmental Protection Agency’s (EPA) revised guidance on diesel exhaust fluid (DEF) inducements.

Products•March 18, 2024

Rislone DEF Crystal Clean Diesel DEF & SCR Emissions System Cleaner Removes Crystal Deposits

Rislone said its DEF Crystal Clean Diesel DEF and SCR emissions system cleaner scrubs away crystal contaminants from the selective catalytic reduction (SCR) systems of diesel cars, trucks, and SUVs.

News•Staff•November 18, 2021

Oregon Adopts Clean-Trucks Rules; Other States May Follow

Oregon's new rules will speed the transition to electric and lower-emissions trucks, buses, and vans, and likely will inspire other states to also adopt the emissions regulations.

News•Staff•March 19, 2021

SoCalGas to Assist Local Fleets in Transitioning to Cleaner Tech

Heavy-duty trucks with the latest natural gas engines can cut smog-forming emissions by more than 90%; fueling with renewable natural gas reduces greenhouse gas emissions by at least 80%.

News•Staff•June 26, 2020

CARB Passes Advanced Clean Trucks Rule

The new California Air Resources Board standard mandates that by 2045, every new truck sold in California will be zero-emission.

News•Staff•April 8, 2020

Funding Opportunity for Zero- and Low-Emission Heavy-Duty Vehicles

The South Coast AQMD released Program Announcements for the 2020 Carl Moyer Program, including the SOON (Surplus Off-Road Opt-In for NOx) Provision. Applications are now being accepted.

Articles•Shelley Mika•January 6, 2020

Gasoline or Diesel: What's the Difference?

Costs. Maintenance. Engine life. Performance. Which powertrain has the advantage? Gasoline, or diesel? Which one is right for your fleet? Likely, it depends.

News•Staff•April 30, 2019

Cummins Reviews Certification of Ram Diesel Engine

Cummins Inc. has begun a formal review of its emissions certification and compliance process relating to diesel engines it supplies to Fiat Chrysler Automobiles for Ram pickups, the engine-maker has announced.

News•Staff•December 6, 2018

City of Beverly Hills Runs 100% Renewable Diesel

The second generation of biofuels and renewable diesel is here, but what does that mean for Beverly Hills fleet manager Craig Crowder? For the City's fleet of 445 vehicles, it means better performance, reduced maintenance, and a more sustainable way to serve the city.

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