What is Adblue diesel exhaust fluid?

Adblue is an additive used in many newer diesel cars and has lately made news for being in short supply. So what is it and what does it do?

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Diesel Exhaust Fluid Volkswagen AdBlue, 1.89L - G052910A2OE - Pro Detailing

DEF/ADBLUE. Diesel Fluid. in Surulere - Vehicle Parts & Accessories, Charles Afunanya

Genuine Jaguar VW AdBlue Diesel Exhaust Fluid (DEF)X 2 Top-Up Bottles - T4N12112

Blue Sky AdBlue® 20L - Viscol Lubricants

Penrite Penblue (ADBLUE) Diesel Exhaust 10L - PENBLUE010 - Penrite

Filtrum DEF - Diesel Exhaust Fluid/Adblue

MAK AdBlue is a premium quality Diesel Exhaust Fluid (DEF) designed to keep the engines of your BS-IV & BS-VI diesel vehicles happy. Let's…

AdBlue® - Enigmaclean

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Diesel Exhaust Fluid - 20 Litre Pail –

AdBlue® Diesel Exhaust Fluid - 10 Litre

HP Diesel Exhaust Fluid -20 Litre : : Car & Motorbike

Does AdBlue®(Diesel Exhaust Fluid) Have a Shelf Life?