DEF Diesel Exhaust Fluid - 5 gallon pail

DEF diesel exhaust fluid, is the mixture of high purity synthetic urea and deionized water that is used in Selective Catalytic Reduction (SCR) systems on diesel engines. Blue def is injected into the exhaust stream via a controlled dosing module where the water vaporizes leaving ammonia molecules free to travel in to the catalytic converter where it reacts and neutralized the NOx molecules, converting it to nitrogen and water.

Ready-to-use formula Made from high purity urea and deionized water Contains no chemical additives or other compounds that could cause SCR system failure Meets the quality standards established by the ISO-22241-1 for Diesel Exhaust Fluid Certified by the American Petroleum Institute