Machinery Chatter
Dan Miller Progressive Farmer Senior Editor
Tue Feb 11, 2014 07:41 AM CST

comply with the government's final Tier 4 diesel emission standards, manufacturers of high horsepower diesel engines will include the use of Diesel Exhaust Fluid (DEF) to reduce the amount of air-polluting exhaust escaping into the air.

DEF is a urea-based chemical designed for use in Selective Catalytic Reduction (SCR) systems to reduce NOx emissions by up to 90%. According to the U.S. EPA, NOx emissions contribute to the formation of ground-level ozone, fine particle pollution and can cause respiratory problems. SCR is an emissions control system that injects a "liquid-reductant," such as DEF into the exhaust stream of a diesel ...

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