by Ivan K. Makoku, Director(AirNox Pty Ltd) | January 20, 2023

Facts of AdBlue® Diesel Exhaust Fluid – Diesel-Driven Car Owners Should Know

Like a human, your car also needs something good to perform better and to reduce pollution. Here comes the AdBlue® also known as diesel exhaust fluid (DEF) that reduces the emission of engines in diesel cars. Generally, diesel vehicles largely discharge NOx (nitrogen oxide) and create air pollution as well as health issues. So, if a diesel vehicle counts on AdBlue® fluid along with SCR technology, it emits less and causes less harm to the environment.

What is AdBlue®?

Most people think that AdBlue® is the same as a fuel additive. It is not an additive but an exhaust fluid. It purifies the exhaust air and turns the air into less harmful components. The SCR (selective catalytic reduction) system converts the poisonous nitrogen oxide into environmentally friendly diatomic nitrogen (N2) and water. Thus, the use of SCR and AdBlue® combo in diesel engines increases the sustainability of a vehicle as well as protects the environment.

  • AdBlue® is a colourless exhaust fluid.
  • It is stored in a separate tank in a vehicle. The tank is coloured blue with a blue filler cap. The tank is usually placed underneath the bonnet of a car or next to the diesel filler cap depending on the type of the vehicle.
  • AdBlue® is also known as Diesel Exhaust Fluid (DEF) and ARLA32 in South America.
  • The urea used in manufacturing AdBlue® is not pig urine but is a man-made and pure solution.

The synchronization between AdBlue®(diesel exhaust fluid) and SCR technology helps to reduce the emission of NOx by up to eighty percent.

How Does AdBlue® DEF Work?

A very tiny amount of AdBlue® is used to control the NOx emission. A little amount of DEF/AdBlue® is injected into the exhaust gases inside the selective catalyst reduction system. At a certain high temperature, AdBlue® gets converted into Ammonia and carbon dioxide. Next, the ammonia reacts with the NOx/nitrogen oxide and transformed into less cohesive nitrogen and water.

This way, AdBlue® increases the performance of your vehicle, and the longevity of the engine, and saves the environment from harmful chemical emissions. AdBlue® can save the diesel consumption by an average of 5% depending on the size of the engine and the driver behaviour.

Why Should You Refill AdBlue®?

The absence of AdBlue® can hamper the performance of your diesel vehicle for sure. It does not only affect the power of the engine but also the performance and your vehicle will emit harmful nitrogen oxide in large amounts. However, when your vehicle will run out of AdBlue® and you stop it once, you cannot restart it. To start your engine again, you need to fill the AdBlue® tank.

When Should I Refill AdBlue® Tank?

In general, your car will give you a signal before the last 2000km to go. You can see a yellowish-brown warning light when the AdBlue® is about to finish. The 2000km driving range should be enough for an average customer to order AdBlue® online at or You should use the proper AdBlue® transfer pump and nozzle to safely transfer it into the tank. Don’t use a random nozzle to transfer AdBlue® into the tank. The nozzle or funnel/spout might be contaminated. If you are not sure, contact us for further guidance.


Buy AdBlue® (diesel exhaust fluid) from a reliable manufacturer like AirNox/AirNoxblue who produce AdBlue® following ISO 22241, ISO 3696 standards and VDA 6 x series. We provide complete AdBlue®solutions to all our customers.