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What is DEF?

is the mixture of high-purity synthetic urea and deionized water that is used in selective catalytic reduction (SCR) systems on diesel engines. Diesel exhaust fluid is a non-hazardous solution/fluid that is injected into the exhaust stream via a controlled dosing module where the water vaporizes, leaving ammonia molecules free to travel into the catalytic converter, where it reacts and neutralizes the NOx molecules, converting them to nitrogen and water.

Key Points:

  • DEF has been widely accepted as a vital fluid in trucks and many diesel pickups and SUVs to meet the emissions standards of BS4/BS6 vehicles.
  • DEF is not a fuel additive and never comes into contact with diesel.
  • . It is stored in a separate tank, typically with a blue filler cap.

DEF Usage

You will not need to replenish your Diesel Exhaust Fluid tank every time you refuel. Diesel Exhaust Fluid consumption will be approximately 3% of your fuel consumption (for every 300L of fuel consumed, you will require 9L of Diesel Exhaust Fluid). Only fill Diesel Exhaust Fluid into the marked Diesel Exhaust Fluid DEF tank on the vehicle.

Some Facts

HOW IT WORKS ?

is carried onboard SCR-equipped vehicles in specially designed tanks and is dosed into the SCR system at a rate equivalent to 2–5% of diesel consumption. This low dosing rate ensures long refill periods, and the use of diesel exhaust fluid helps improve fuel economy, allowing fleets to realize a reduction in overall operating costs.

Engine DEF SCR H2O N2

SCR (Selective Catalytic Reduction) ?

SCR is a new technology that leading Indian heavy-duty diesel engine makers adopted after testing various technologies intended for reducing emission levels to the required EPA standards. SCR technology achieves the reduction of exhaust fume emissions required and allows for maximum engine operation in terms of performance and fuel economy. The use of YBlue DEF is the most effective way to take full advantage of SCR technology and to protect engine systems from the possibility of gradual degradation or clogging due to contamination. It also helps to prevent the loss of efficiency, costly parts replacement, and engine downtime.

SCR/DEF Maintenance Points:

  • When filling the tank wipe-up any spillage - Check DEF solution quality for shelf life and any contamination
  • Check level and fill to mark if required In low ambients, check tank and delivery tube heaters Check DEF filter and change at recommended period