AdBlue is a solution made up of urea and water which is injected into the vehicle's exhaust system, reacting with the Nitrogen Oxide (NOx) before it leaves the exhaust, breaking it down into harmless nitrogen and oxygen. It does this by turning into ammonia and it's this process that breaks down the NOx and significantly reduces the amount of NOx particles in exhaust emissions. The process is managed by a Selective Catalytic Reduction (SCR) system. Our AdBlue is manufactured within Verband der Automobilindustrie e.V. (VDA) via a Sub licence from Euroliquids. AdBlue is manufatured to the high standards of ISO22241 (issued by the International Standardisation Organisation). Every batch of Adblue we make is independently lab tested and certified. Beware of similarly branded products available for lower prices than officially branded Adblue - these are often unlicensed and may cause damage to your vehicle.