Small Jugs


  • 1 and 2.5 gallon bottles are an excellent source for personal use trucks.
  • The average truck can run up to 600 miles on one bottle.
  • The bottle is designed for easy filling.


55 Gallon Drum


  • Provides an average of 15,000 miles of DEF (Results may vary depending on your vehicle).
  • Holds 55 US gallons or 207.9 liters
  • 24” x 24” x 36”
  • Approximate 500 lbs full


275 Gallon Tote


  • Provides an average of 70,000 miles of DEF (Results may very depending on your vehicle)
  • Holds 275 US gallons or 1,040 liters.
  • 40” x 48” x 40”
  • Approximately 2,500 lbs full

Diesel Exhaust Fluid (DEF) 


What is 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.


How much 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%.


How much should I expect to pay for DEF?

The price of Diesel Exhaust Fluid (DEF) will depend on your location, supply method and the volume of fluid that you intend purchase. DEF also comes in pre-packaged quantities in 1, 2.5 and 4 gallon jugs. This is the most expensive method on a per-gallon basis, followed by 55 gallon drums and 275 or 330 gallon totes. Bulk volumes, which are delivered directly to your company or terminals, are the cheapest way to buy DEF. DEF will soon be able to be purchased at our convenience store pumps. The cost saving of moving from single gallons to tote supply direct from Cooper Petroleum, Inc. is approximately 30%.


Is DEF corrosive?

Diesel Exhaust Fluid (DEF) is not toxic, harmful or dangerous. In fact, of all the fluids used in a truck, such as diesel, engine oil, brake fluid, antifreeze and windscreen wash, DEF is the least hazardous. However, DEF is corrosive for some metals such as carbon steel, aluminum, copper and zinc, and DEF should not be stored in containers made of these materials. 


What is the shelf life of Diesel Exhaust Fluid (DEF)?
Diesel Exhaust Fluid (DEF) has a shelf life of two years. However, this can be reduced if the fluid is exposed to direct sunlight or if the temperature of the DEF remains above 86°F (30°C) for sustained periods. All DEF packaging should be labeled with an expiration date. If you have DEF that it beyond its expiration date, contact the supplier for advice, or dilute it with water in a ratio of 1:10 and use it on your lawn!