Diesel Exhaust Fluid (DEF)

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What Is DEF?

Diesel Exhaust Fluid (DEF) is a water-urea solution (32.5% high-purity urea and 67.5% deionized water). It is non-toxic, nonflammable, non-hazardous and non-explosive.

The purpose of DEF is to reduce nitrogen oxide (NOx) concentration in the exhaust emissions produced by diesel engines. The process by which NOx emissions are reduced is called Selective Catalytic Reduction (SCR).

DEF is generally carried in a separate storage tank in diesel-powered vehicles equipped with SCR technology. DEF is injected into the hot exhaust stream of an engine and absorbed onto a catalyst. In this way it helps break down the NOx gases in the exhaust into nitrogen gas and water vapor, both harmless to the environment.

Why Should I Use DEF?

How Can DEF Help My Fleet?

In addition to helping to meet NOx emission standards, DEF can also provide fuel savings. Fleet experience with heavy duty trucks model year 2010 and newer suggest 5% fuel savings compared to 2007 model year vehicles with similar engines.

Is All DEF The Same?

Not all DEF is created equal. You should make sure the DEF you are purchasing meets industry standards, including API and ISO requirements, to ensure it is manufactured properly, to high-quality standards, and is doing the job it’s supposed to do. Check out this article from Blue Sky, to learn more.

Woodford is proud to be an authorized Blue Sky DEF distributor. Blue Sky is a premier DEF supplier with regional manufacturing and distribution centers across North America.

How Can I Save Money On DEF For My Fleet?

Learn More

Read our blog to learn more about DEF and how Woodford can help you save money on your next DEF purchase. You can also check out the Blue Sky website for additional technical product information.

Contact Woodford for more information on our DEF products, on-site storage, pricing, and delivery options.