What is DEF?
Diesel Exhaust Fluid (DEF) – DEF is a urea-based chemical reactant designed specifically for use in SCR systems to reduce NOx emissions.
How DEF Works
Selective Catalytic Reduction (SCR) is an exhaust after treatment system that injects a small amount of a chemical called Diesel Exhaust Fluid (DEF) into the exhaust. DEF is mixed with exhaust in the presence of a catalyst turning NOx (oxides of nitrogen – a harmful pollutant that contributes to smog and acid rain) into harmless nitrogen and water vapor.
Advantages of SCR
- SCR provides better fuel economy
- SCR meets 2010 Vehicle Emissions Standards for Diesel Engines
- SCR improves engine lubricant and filter life