Diesel Exhaust Fluid Specifications

DEF is a simple, non-toxic and inexpensive pre-mixed fluid composed of 2/3 pure water and 1/3 automotive grade urea. DEF is manufactured to strict quality standards to ensure proper emissions control. The American Petroleum Institute has developed a quality certification program to ensure the quality of DEF available at service outlets. Only DEF that meets DIN70700 or ISO 22241-1 specifications should be used.