DEF Facts

What is DEF and how should I use it? DEF is a high purity solution of urea in de-ionized water (32.5%). It is used to chemically reduce NOx emissions from vehicles powered by diesel engines. DEF is contained in a separate tank and sprayed into the exhaust gases. Never fill the diesel fuel tank with DEF.

How much DEF will I need? Your DEF consumption will be approximately 2-3% of your diesel fuel consumption (approx 2-3 gallons for every 100 gallons of diesel used.) Newer model trucks are consuming higher levels of DEF, 3-6%, to achieve increased fuel economy and greenhouse gas emission targets.

Is DEF harmful? DEF is not harmful neither for humans or animals. DEF is not explosive and is non-toxic. If you get it on your skin or clothes, rinse with plenty of water.

Will DEF burn? DEF does not burn and will not aid combustion.

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