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Exol Diesel Exhaust Fluid (eco Blue) EXOL DIESEL EXHAUST FLUID (ECO BLUE)Description Exol’s Diesel Exhaust Fluid (DEF) also known as EcoBlue is a non-hazardous solution, which is 32.5% urea and 67.5% de-ionized water. DEF is sprayed into the exhaust stream of diesel vehicles to break down dangerous NOx emissions into harmless nitrogen and water. This system.