(800) 661-9391 | Contact Us | Get a Quote DIESEL EXHAUST FLUID Diesel Exhaust Fluid Diesel Exhaust Fluid (DEF) is an Aqueous Urea Solution formulated for your SCR system. Diesel Exhaust Fluid (DEF) DEF is a urea-based chemical reactant designed specifically for use in SCR systems to reduce NOx emissions. All of our DEF meets accepted international standards for purity and composition, including ISO22241, and API® (American Petroleum Institute) certification. Calculating DEF Usage DEF usage varies based upon vehicle operation, duty cycle, environmental conditions, and ratings. For most on-highway vehicles, DEF consumption is approximately 2% of diesel fuel consumption. To calculate your DEF consumption, use the following equation: Annual Consumption =(Annual mileage / MPG) * 2% * Number of Vehicles Storage DEF should be stored in a cool, dry, well-ventilated area, out of direct sunlight. While the optimum storage temperature is up to 77° F (25° C), temporary exposure to higher temperatures has little to no impact on the quality of DEF. DEF should be kept from freezing. Maintain System per your Engine Manufacturer's Recommendations Improper use of DEF in the engine and after treatment systems is highly likely to cause significant damage. Take care to avoid cross contamination of DEF into the diesel fuel tank; likewise, avoid dispensing of diesel fuel into the DEF tank. Diesel Exhaust Fluid Brands LICENSED BRANDS OUR BRANDS 1000 Tennessee Ave. Cincinnati, OH 45229 | PH: (800) 661-9391 | sales@kostusa.com PRODUCTS MARKETS COMPANY SERVICES BRANDS Antifreeze/Coolants Stationary Engine Coolants FRH Fluids Heat Transfer Fluids NatGas Dehydration Fluids Consumer Products Oil & Gas Automotive & Heavy Duty Industrial HVAC & Refrigeration Manufacturing About Us Contact Us News & Media Industry Calendar Careers Recochem EHS Private Labeling KOSTCare™ Fluid Analysis Program Technical Support KOST Calculator PDS SD DefendAL BIOChill KOSTChill KOSTherm ToughinAL AchievAL Copyright © 2021. KOST USA. All Rights Reserved | Delivery Guidelines | Warranty | Apply for Credit