AdBlue® is used in the catalytic process of exhaust gas treatment in vehicles equipped with SCR (Selective Catalytic Reduction). It is a reducing agent used to significantly reduce nitrogen oxides (NOx) in the exhaust gases produced during combustion. - AdBlue® can be used in all vehicles equipped with SCR technology. - AdBlue® is not a fuel additive. It should not be mixed with or added to the fuel tank.