DEF 101

What Is Diesel Exhaust Fluid?

Diesel exhaust fluid, or 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 and fully adheres to international quality standards set forth by ISO-22241-1. DEF is also a purer fluid alternative as it contains no chemical additives, which is important to maintaining a functioning SCR system. By using DEF, you get better diesel performance and avoid harmful emissions.

How Much Fuel Consumption Does DEF Account For?

DEF weighs 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, well-ventilated area that does not receive direct sunlight. When stored properly, DEF’s shelf life can be extended up to (but no more than) two years.

Is DEF Corrosive?

DEF is corrosive to zinc, aluminum, carbon steel, and copper. Beyond these 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, no protective clothing is required when handling DEF.

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, contact your DEF supplier immediately for further instructions.

Where Can DEF Be Purchased?

Burkett Oil Company is a lubricant and fuel distributor based in Atlanta, Georgia. We provide high-quality products to auto shops, industrial plants, and other businesses needing oil, grease, and coolants/antifreeze. Burkett Oil is also the exclusive Atlanta supplier of Blue Sky DEF.  We offer product in the following sizes:
  • 2.5-gallon jugs
  • 55-gallon drums 
  • 275-gallon IBC Totes
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