Blog > March 2018 > Diesel Exhaust Fluid (DEF) FAQ’s

Diesel Exhaust Fluid (DEF) FAQ’s

March 7, 2018


Why DEF? In an effort to reduce environmental pollution and promote cleaner diesel emissions, EPA standards were revised in 2010 to significantly reduce harmful NOx (oxides of nitrogen emitted from engines) levels from new trucks. As a result, original equipment manufacturers and many trucking fleets have chosen selective catalytic reduction (SCR) technology as a way to reduce NOx emissions and improve fuel economy and reliability without changing the design or operation of the basic engine. Here are some frequently asked questions and answers to help better understand DEF.


  1. What is DEF? DEF is a mixture of high purity synthetic automotive grade urea and deionized water. It is not a diesel additive.
  2. Who uses DEF? Most diesel-powered on-road vehicles produced since 2010 utilize SCR technology and require DEF. This includes heavy-duty trucks, diesel pick-ups, delivery vans and European luxury cars. Diesel-powered off-road equipment such as agricultural and construction equipment has been required to use SCR technology since 2014.
  3. Where is it stored? DEF is stored in a dedicated tank next to the fuel tank on the driver’s side on most vehicles. The tank fill opening is designed to accommodate a DEF fill nozzle to ensure only DEF is put into the truck – it is nearly impossible to add diesel fuel accidentally.
  4. Is DEF safe to handle? DEF is non-hazardous, non-toxic, non-flammable and non-explosive. It is classified as minimum risk for transportation and is safe if it touches skin.
  5. Is DEF prone to contamination? Yes. SCR systems are extremely sensitive to chemical impurities in the urea solution. Just one teaspoon of salt can contaminate 5,000 gallons of DEF – purity is critical to ensuring proper function.
  6. What should I know about storing and handling DEF? Product integrity is critical to ensure DEF is preserved. DEF should be stored and dispensed in equipment manufactured in accordance to the strict ISO 22241 standards. All wetted materials should be DEF compatible, including tanks, piping, hoses, nozzles, fittings and seals. Utilizing proper equipment throughout distribution will protect DEF integrity and avoid equipment failure.
  7. Can I purchase DEF at CVA? YES! DEF is currently available at the pumps at two retails sites in Kansas, Beloit & Clay Center Highways sites. DEF is coming soon (summer 2018) to our Utica, NE. fueling location.

You can order DEF packaged or in bulk in Beloit, Kan., Shelby, Neb., or Le Mars, Iowa. To order DEF at one of these sites, call 785-738-9633 in Beloit, 402-362-8434 in Shelby or 712-546-6382 in Le Mars.

Posted: 3/7/2018 3:47:07 PM by | with 0 comments
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