Diesel Exhaust Fluid (DEF)

What is Diesel Exhaust Fluid (DEF)?
Diesel exhaust fluid (DEF) is a urea-based solution that reduces harmful nitrogen oxide emissions from diesel engines. DEF is composed of 32.5% high-purity urea and 67.5% deionized water. DEF is clear, odorless and safe to handle.

The solution is added to a separate storage tank in diesel-powered vehicles equipped with selective catalytic reduction (SCR) technology. The fluid is injected into the hot exhaust stream of the vehicle and helps break down the nitrogen oxide gases in the exhaust into nitrogen gas and water vapor, both harmless to the environment.

Why Use DEF?

It is an inexpensive and efficient option for lowering NOx emissions. Nitrogen oxide (NOx) is produced from the exhaust of diesel vehicles and is a major contributor to smog and other air pollution. Exposure to NOx can also lead to respiratory and heart disease. This is why in 2010, the U.S. Environmental Protection Agency (EPA) mandated that all new diesel engine vehicles reduce NOx emission levels by 90%.

It improves engine performance and fuel efficiency. The combination of DEF and SCR technology not only reduces NOx emissions, it actually improves a vehicle’s horsepower by making diesel engines run more efficiently, resulting in fuel savings of up to 8%.

 


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