From the particulate filter, the exhaust gas travels past a nozzle which sprays diesel exhaust fluid into the stream of gases. DEF is made from deionized water and a very pure form of urea.

Not at all because exhaust fluid is quite affordable. “I know the auto-parts stores, if you were to buy it yourself at one of these places it’s roughly $5.00 per gallon,” said Skorupski.

DEF is "Diesel Exhaust Fluid" and, as a matter of fact, modern diesels run just fine without it. DEF is instead concerned with what comes out of modern diesel engines.

But one of the secrets to mitigating their emissions is the usage of diesel exhaust fluid (DEF), also known as AdBlue. The DEF injector on a 2015 Volkswagen Jetta TDI. Chris Rosales.

Diesel exhaust fluid, or DEF, is a key component in lowering pollutants emitted from diesel engines, helping to improve efficiency and reduce emissions.

That includes the development of an additive known as Diesel Exhaust Fluid, often referred to as DEF for short. Introduced in 2010, the DEF additive is a compound made from a mixture of 32.5% ...

If you do crank your engine after adding Diesel Exhaust Fluid to your fuel tank, you likely won't be on the road for very long, as the presence of DEF in your fuel system will almost certainly ...

Diesel exhaust fluid, also known as DEF, AUS (from aqueous urea solution), or AdBlue, is used to lower the concentration of NOx in diesel exhaust emissions.Usually, the DEF tank filler is placed ...

That includes the development of an additive known as Diesel Exhaust Fluid, often referred to as DEF for short. Introduced in 2010, the DEF additive is a compound made from a mixture of 32.5% ...