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Conklin Diesel Exhaust Fluid (DEF) is for use in 2010 and newer diesel engines utilizing a Selective Catalytic Reduction (SCR) system, and will typically be used at a rate of 2% to 3% of your diesel fuel consumption to reduce nitrogen oxide (NOx) emissions. Conklin Diesel Exhaust Fluid is a pre-mixed and ready-to-use product compatible with all on-and off-road SCR systems. As your DEF usage will vary based on several factors, you can initially estimate that you will consume DEF at a rate of 2%-3% of your diesel fuel consumption. Therefore, you will require 2-3 gallons of DEF for every 100 gallons of diesel you consume. For example, if your diesel pickup gets 18 mpg and is only driven 24,000 miles, you may require 40 gallons of DEF per year at the 3% usage rate. For additional information to gauge your yearly DEF needs in Over the Road/ Line Haul Trucks, Diesel Pickup Trucks, and Agricultural Tractors please see the DEF Usage Calculator below.

DEF USAGE CALCULATOR

For the Over the Road/Linehaul TRUCKS
Enter the number of trucks using Diesel Exhaust Fluid gallons of DEF consumed per year
Enter the average number of miles put on your trucks per year  
Enter the average mpg fuel mileage of your trucks  
Enter your DEF usage rate (will vary from 2% to 6%) %  
 
FOR Diesel Pickup TRUCKS
Enter the number of trucks using Diesel Exhaust Fluid gallons of DEF consumed per year
Enter the average number of miles put on your trucks per year  
Enter the average mpg fuel mileage of your trucks  
Enter your DEF usage rate (will vary from 2% to 6%) %  
 
FOR AGRICULTURAL TRACTORS
Enter the number of tractors using Diesel Exhaust Fluid gallons of DEF consumed per year
Enter the average number of hours put on your tractor per year  
Enter the average fuel usage by hour Gallons per hour  
Enter your DEF usage rate (will vary from 2% to 6%) %