Adblue/def diesel exhaust fluid is an aqueous urea solution with nox-reducing agent for diesel engines with scr-exhaust gas after treatment 1.89 liter/ 1/2 gallon imported from germany,vehicle fitments mercedes-benz all models,vw/audi all models,bmw group,peugeot/citrone all models,jaguar/land rover all models and also fits heavy duty trucks