AdBlue - What Is It?
The AdBlue itself is a specialized liquid for SCR (Selective Catalytic Reduction) systems. It’s a 32.5% nominal concentration aqueous solution of urea. AdBlue reduces the nitrogen oxides in the car’s emissions. Unfortunately, SCR systems have high operational costs.
AdBlue liquid is stored in a separate tank - it can be placed in various locations, depending on the car model. For example, you can find it in the boot/trunk, under the hood or even near the diesel tank’s neck. From there, the liquid flows to the SCR catalyst and works its magic, reducing nitrogen oxides to harmless water and nitrogen.
AdBlue liquid is stored in a separate tank - it can be placed in various locations, depending on the car model. For example, you can find it in the boot/trunk, under the hood or even near the diesel tank’s neck. From there, the liquid flows to the SCR catalyst and works its magic, reducing nitrogen oxides to harmless water and nitrogen.

AdBlue Removal Files
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SCR System’s Disadvantages
Despite being beneficial for our health and the environment, SCR and AdBlue systems carry some serious disadvantages that have pushed many drivers to switch them off. The most common among them are as follows:
- Susceptibility to damage due to its complexity - full-scale repair’s cost reaches several thousand dollars
- High liquid’s cost - the operating costs increase, the more you drive
- Liquid’s corrosivity - AdBlue’s spills can easily damage vulnerable car parts or even the anti-corrosive paint’s coating
- Vulnerability to low temperatures - AdBlue freezes at -11 °C (12,2 °F), which can lead to pump’s failure (its crystals can clog the injection system), if the tank’s heater is faulty