About DEF

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.
DEF Dosing System Diagram

Advantages of SCR

  • SCR provides better fuel economy
  • SCR meets 2010 Vehicle Emissions Standards for Diesel Engines
  • SCR improves engine lubricant and filter life

Product We Offer

Terra Clair
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Burlington, Camden, Gloucester, Salem, Mercer Counties, New Jersey

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New Jersey, SE Pennsylvania, and Northern Delaware



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