What is AdBlue? AdBlue Diesel Exhaust | The AA
www.theaa.com › breakdown-cover › adviceAdBlue is an exhaust fluid, not a fuel additive. It's stored in a separate reservoir and is topped up via a (usually) blue filler cap located either next to your fuel filler, in the boot or under the bonnet. It's a trade name registered by the German car manufacturers association, but is the most recognised form of Diesel Exhaust Fluid (DEF).
Diesel exhaust fluid - Wikipedia
https://en.wikipedia.org/wiki/Diesel_exhaust_fluidDiesel exhaust fluid (DEF; also known as AUS 32 and marketed as AdBlue ) is a liquid used to reduce the amount of air pollution created by a diesel engine. Specifically, DEF is an aqueous urea solution made with 32.5% urea and 67.5% deionized water. DEF is consumed in a selective catalytic reduction (SCR) that lowers the concentration of nitrogen oxides (NO x) in the diesel exhaust emissio…