AdBlue:

• Diesel Exhaust Fluid DEEF, also known as AdBlue in Iran and Europe and based on ISO 22241, is a urea solution consisting of 32.5% pure urea (AUS 32) and 67.5% water. Dionysus is formed.
  AdBlue is widely used in Euro 5 and Euro 6 diesel vehicles. This solution is a liquid used in the Selective Catalytic Reduction (SCR) of diesel vehicles and greatly reduces the toxic gases of NOx nitrogen oxides. The German Automobile Manufacturers Association (VDA) controls and manages the AdBlue brand.
• What does AdBlue do?

Without AdBlue, many new diesel cars would produce more nitrogen oxides than Euro 6 emissions regulations. It is a non-toxic liquid and most of it is water and urea. This substance is used as part of the selective catalytic reduction of SCR. SCR breaks down nitrous oxide produced by diesel engines. By injecting a small amount of ADBL into the exhaust, you will see the conversion of toxic particles into water and oxygen.

• AdBlue and diesel pollution

The primary purpose of diesel engines was to find a solution to climate change because they emit less carbon dioxide than gasoline engines. Governments have imposed even lower taxes on these cars to encourage buyers to opt for diesel engines.

Of course, just like governments, the general consensus changed and diesel engines were no longer as popular as before. Although these engines produce less carbon dioxide, they also emit more pollutants and NO2 than gasoline engines.
AdBlue was the solution to these problems, and with the introduction of Euro 6 pollution laws in September 2015, its use became a necessity. AdBlue is injected into the car exhaust and reacts with nitrous oxide gas, converting it into harmless elements of nitrogen and oxygen.

 How effective is AdBlue? Well, in fact, it must be said a lot! In 2017, a study was conducted by the University of Leeds in the United Kingdom, and scientists concluded that the amount of toxic nitrogen dioxide produced by Volkswagen Polo equipped with a 1.4-liter diesel engine is as much as the pollution of a truck equipped with a 13-liter diesel engine with AdBlue!

• When to fill AdBlue?

The amount of AdBlue remaining in the tank depends on many factors such as the dimensions of the AdBlue tank, driving style and vehicle fuel consumption. Of course, in order to estimate, it should be said that for every 1000 kilometers of driving, about 1 liter of AdBlue will be consumed.
Refilling the AdBlue tank will not be the same as refilling a diesel or gasoline tank. If you add only a small amount of AdBlue to the tank, the amp will not work properly in the car. Also, if you buy an AdBlue bottle, you should use it all because the rest will not be usable in the future.