The EPA is escalating its response to consumer complaints regarding DEF system failures, announcing a new investigation aimed at 14 major manufacturers.

EPA demands DEF failure data from diesel makers. Investigation could force recalls and software fixes for engines already on U.S. roads. 30-day deadline set.

Under certain conditions, the water in DEF can evaporate, leaving behind white crystal urea deposits. Over time, these crystals can build up, clogging system components and interfering with normal ...

Keep Diesel Emissions Systems Crystal-Free New Rislone Diesel DEF Treatment Super Concentrate stabilizes and improves diesel exhaust fluid (DEF) to prevent crystallization and enhance selective ...

U.S. Environmental Protection Agency Administrator Lee Zeldin was at the Iowa State Fair Aug. 12, 2025 with U.S. Small Business Administrator Kelly Loeffler, right, and Gov. Kim Reynolds second from ...

Diesel engines are known for several things. Power and torque are the biggest attractions, but there is another attribute that drivers like. They can rack up a lot of mileage without needing major ...

Add Yahoo as a preferred source to see more of our stories on Google. (Photo/Ram) Just two weeks ago, the head of the Environmental Protection Agency (EPA) made an extraordinary announcement: ...

Since 2010, diesel-powered on-highway trucks in North America have been using selective catalytic reduction (SCR) as an exhaust after-treatment technique to control nitrogen-oxide (NOx) emissions. And ...

HOLLY, Mich., April 16, 2025 (GLOBE NEWSWIRE) -- A diesel truck, car or SUV that is losing power and fuel economy, shutting down unexpectedly, and/or has a DEF warning light illuminated is probably ...