DEF 101

What Is Diesel Exhaust Fluid?

DEF is an aqueous solution composed of 32.5% urea (a naturally occurring nitrogenous element) and 67.5% deionized water. DEF is added to a separate storage tank in vehicles equipped with selective catalytic reduction (SCR) technology. The fluid is injected into the hot exhaust stream of the vehicle, turning the urea solution into ammonia. This process helps break down the nitrogen oxide gases in the exhaust into nitrogen gas and water vapor, both harmless to the environment.

What are the Advantages of Using DEF?

DEF is certified by the American Petroleum Institute (API) and fully adheres to the quality standards set forth by the ISO-22241-1. DEF also contains no chemical additive(s) and the purity of diesel exhaust fluid is important to maintaining a functioning SCR system. By using diesel exhaust fluid, you get better diesel performance and avoid harmful emmissions.


How Much Fuel Consumption Does DEF Account For?

DEF weights around 9 lbs. per gallon and accounts for around 2% of fuel consumed.

What Is the Shelf Life of DEF?

DEF needs to be stored in a cool and well-ventilated area that does not receive direct sunlight. When stored properly DEF’s shelf life can be extended up to usually no more than two years.

Is DEF Corrosive?

DEF is corrosive for the following metals: zinc, aluminum, carbon steel, and copper. Other than for the aforementioned metals DEF is not corrosive, toxic, or dangerous. Surprisingly, DEF is actually less hazardous than other common automotive fluids such as brake fluid and antifreeze. As such, when handling DEF no protective clothing is required.

What If DEF Spills?

Small spills of DEF can easily be washed, wiped, or mopped away. If it dries, it forms a crystalline material that can also be easily cleaned up. If a large spill of DEF occurs you should immediately contact your DEF supplier for further instruction.

Where Can DEF Be Purchased?

Burkett Oil Company is the exclusive Atlanta supplier of Blue Sky DEF diesel exhaust fluid. Our Atlanta, Georgia area product offerings include: 
  • 2.5 gallon jugs DEF
  • 55 gallon drums DEF
  • 275 gallons IBC Totes DEF