Adblue. Ultrapure formaldehyde-free Nitrogen Oxide reducing treatment specifically formulated for diesel engines equipped with Selective Catalytic Reduction (SCR). SCR meets the new 2010 Vehicle Emission Standards for diesel engines. Pro-99 Adblue Diesel Exhaust Fluid meets stringent AUS 32, DIN 70070 ISO2241 purity and concentration standards. A safe and environmentally-friendly solution for Selective Catalytic Reduction. *By request/order.