Diesel Exhaust Fluid - 2.5 Gallon

Colonial™ Diesel Exhaust Fluid (DEF) is a high-purity, urea-based solution designed to reduce harmful NOx emissions in diesel engines using Selective Catalytic Reduction (SCR) systems. Manufactured to meet ISO 22241 and API certification standards, Colonial DEF ensures consistent quality and compatibility with all SCR-equipped vehicles. With over 20 years of experience in NOx abatement chemistry, Colonial offers DEF in bottles, drums, totes, and bulk — making it a trusted choice for fleets, retailers, and off-road operations.