DEF

Diesel Exhaust Fluid

XProlube Diesel Exhaust Fluid (DEF) is a high-purity solution of 32.5% automotive-grade urea in deionized water, manufactured to the ISO 22241 / AUS 32 standard. It is injected into the exhaust of Selective Catalytic Reduction (SCR) diesel engines, where it converts harmful NOx emissions into harmless nitrogen and water vapor to meet emissions regulations. Clear and colorless, it must be kept clean and stored within recommended temperatures to maintain SCR performance.