what is adblue
Diesel exhaust fluid for sale in small quantities. Diesel exhaust fluid (DEF), commonly referred to as AdBlue and standardised as ISO 22241 is an aqueous urea solution made with 32.5% high-purity urea (AUS 32) and 67.5% deionized water.EF is stored in a tank on board the vehicle, and injected into the exhaust stream by a metering system. The injection rate depends on the specific after-treatment system, but is typically 2â6% of diesel consumption volume.