Diesel Exhaust Fluid, or “DEF,” is an additive that reduces the harmful emissions of nitrogen oxide from diesel engines. It is a urea solution made up of two components: 32.5% high-purity urea, and 67.5% deionized water. DEF is safe to handle, odorless, clear, biodegradable, and non-flammable. Its use is required by the government for all new diesel vehicles.
The exhaust produced by diesel-powered vehicles contains Nitrogen Oxides (“NOx”), a group of harmful air pollutants. Diesel Exhaust Fluid is used to “diffuse” the harmful gases. Using selective catalytic reduction (SCR) technology that the vehicles are equipped with, DEF is injected into the exhaust stream. The SCR system allows the DEF to break down the toxic NOx into water vapor and nitrogen gas. Both nitrogen and water already exist in the air we breathe and have no adverse effects on the environment.
Glad you asked! We’re proud to brag on DEF, because the benefits are numerous:
This is important because:
The effects of this include:
PickupTrucks.com states that some of the benefits of DEF-equipped trucks include:
The Environmental Protection Agency’s 2010 mandate requires all heavy duty trucks and machinery to reduce NOx emissions.