DEF is a key component in lowering pollutants emitted from diesel engines, helping to reduce harmful emissions.

Shell Rotella has introduced its own Diesel Exhaust Fluid, designed for on-highway medium- and heavy-duty trucks as well as off-highway construction equipment and trucks. Shell Rotella DEF is a high ...

Prestone Command diesel exhaust fluid (DEF) is a colorless, odorless, nontoxic and nonflammable liquid solution consisting of 67.5% demineralized water and 32.5% high-quality automotive-grade urea. It ...

This story appears in the June 13 print edition of Transport Topics. The Environmental Protection Agency last week updated its guidance for certification of heavy-duty truck engines using selective ...

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 ...

When it comes to reducing the nitrogen oxide (NOx) emissions of diesel-burning commercial vehicles, selective catalytic reduction (SCR) is firmly in place as today’s technology. And these systems are ...

Key to the care and feeding of today's latest engines is a mysterious fluid called DEF (diesel exhaust fluid). Following is some information about DEF to help you manage your Tier 4 equipment for ...

Most Tier 4 Final construction equipment over 75 hp utilizes selective catalytic reduction (SCR) exhaust aftertreatment technology to convert NOx to N2 and water through a chemical reaction. This ...

As engine and equipment manufacturers launch new generations of equipment to meet U.S. EPA Tier 4-Interim and -Final emissions regulations, equipment managers can rest assured that using new Tier ...

This story appears in the July 18 print edition of Transport Topics. Click here to subscribe today. Navistar Inc. has formally resumed its battle with the U.S. Environmental Protection Agency, filing ...

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 ...