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What is Diesel Exhaust Fluid (DEF)?
Diesel Exhaust Fluid (DEF) is a non-hazardous solution, which is 32.5% urea and 67.5% de-ionized water. DEF is sprayed into the exhaust stream of diesel vehicles to break down dangerous NOx emissions into harmless nitrogen and water. This system is called Selective Catalytic Reduction (SCR) and can be found on 2010 and later model year trucks and many diesel pickups and SUVs. DEF is not a fuel additive and never comes into contact with diesel. It is stored in a separate tank, typically with a blue filler cap.
What is Selective Catalytic Reduction (SCR)?
SCR technology uses a catalyst system to break down dangerous NOx emissions produced by diesel engines into nitrogen and water. The chemical reactions used in SCR systems require a constant feed of ammonia gas. In automotive applications SCR delivers ammonia using a urea solution called Diesel Exhaust Fluid (DEF). DEF is sprayed into the exhaust stream by an advanced injection system and then converted into ammonia on a catalyst. The ammonia breaks down dangerous NOx emissions produced by diesel engines into nitrogen and water.
Where can I buy Diesel Exhaust Fluid (DEF)?
discoverDEF.com has extensive listings of truck stop and retail locations where you can purchase Diesel Exhaust Fluid (DEF) in jugs or at the pump, as well as fleet suppliers that can deliver to your facility. See our Fleet Supply and Retail DEF Search pages to find a supplier near you.
How much Diesel Exhaust Fluid (DEF) will my truck consume?
Diesel Exhaust Fluid (DEF) consumption is measured as a ratio of diesel fuel use, normally termed the "dosing rate" or "treat rate". Medium- and heavy-duty vehicles have a dosing rate of 2-3%. This means that if your truck has a fuel efficiency of six miles per gallon and a dosing rate of 3% it will use approximately 1 gallon of DEF every 200 miles.
Feedback from a number of fleets suggests that the dosing rate is slightly lower than originally predicted by manufacturers, at around 2.0-2.5%.
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