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AdBlue is a high-purity urea solution in demineralized water and - carried onboard SCR* equipment - is used to reduce emissions of oxides of nitrogen from the exhaust of diesel engined motor vehicles.
AdBlue is dosed into the SCR system as a diesel exhaust fluid; it is not a fuel additive. In the exhaust, the nitrogen dioxides are converted into water vapour and nitrogen. Therefore, the engine can be better tuned, the NOx emission is reduced and less fuel is being used.
* Selective Catalytic Reduction