What is DEF and how should I use it?
DEF is a high purity solution of urea in water (32.5%). It is used to chemically reduce Nox emissions from trucks and buses 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?
You will not need to replenish DEF every time you refill with diesel fuel. The DEF consumption will be approximately 3% of your diesel fuel consumption (for every 100 gallons of diesel consumed you would need 3 gallons DEF).

Is DEF harmful?
DEF is not harmful neither for humans nor animals. DEF is not explosive. It is non-toxic. If you get it on your skin or clothes, rinse with plenty of water. Eyes: Flush with clean water immediately for at least 15 minutes. Although DEF is a colourless liquid, it is best to avoid spilling on clothing or vehicle upholstery as it may leave a stain.

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

What makes Air1®DEF so special?
Air1® is DEF by Yara and often the DEF you will get when your new truck is delivered to you. Heavy-duty vehicle manufacturers demand a high level of purity for DEF to honor the warranty they give on their vehicles.

Certified by the API, Yara is a premier producer of DEF,this guarantees that Air1 will be protected from impurities and thus will not harm your vehicle's catalyst. Choosing Air1 brings you reliability and reassurance!