- AdBlue® is used in the exhaust gas catalysis process in vehicles equipped with SCR (Selective Catalytic Reduction). This component is a reducing agent used to rid exhaust gases of a significant proportion of the nitrogen oxides (NOx) produced during combustion. - AdBlue® can be used by all vehicles equipped with SCR technology - AdBlue® is not a diesel additive. It must not be mixed or added to the fuel tank