Diesel Exhaust Fluid / DEF

Diesel Exhaust Fluid / DEF

What is DEF or Diesel Exhaust Fluid ?

Diesel Exhaust Fluid (DEF) is a non-hazardous solution, which is 32.5% urea and 67.5% de-ionized water. DEF is sprayed into the exhaust stream of diesel vehicles to break down dangerous NOx emissions into harmless nitrogen and water. This system is called Selective Catalytic Reduction (SCR) and can be found on 2010 and later model year trucks and many diesel pickups and SUVs. 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 Diesel Exhaust Fluid

Why Do I Need Diesel Exhaust Fluid  ?

Selective Catalytic Reduction (SCR) is the technology of choice for most leading truck and engine manufacturers to meet the new regulations for diesel exhaust emissions.

With SCR engines, drivers must maintain adequate levels of DEF in a truck’s DEF tank at all times.

Before a truck’s DEF tank runs empty, the driver is alerted through dashboard displays. If a truck is allowed to run out of DEF:

  • the engine power is reduced
  • a solid red warning will be displayed
  • vehicle speed will be limited until the DEF tank is refilled

Read More:  http://www.discoverdef.ca/def-overview/faq/

Pick Up Your DEF Diesel Exhaust Fluid today at D&T Auto Parts in Leamington.

DEF Fluid


2 Responses to “Diesel Exhaust Fluid / DEF”

  • Chris Labbate

    You Can Purchase DEF at any Local CarQuest Auto Parts Store across North America. If your in our neck of the woods, Leamington Ont. You can Visit DT AUTO at 24 Fraser Rd

    9 years ago Reply
  • Interesting product for my truck. Where can I buy it?

    Thanks and regards,


    9 years ago Reply