Diesel Exhaust Fluid Explained Simply

The all-new Ford 6.7L Power Stroke V8 Turbo Diesel uses Selective Catalytic Reduction and Diesel Exhaust Fluid to meet stricter government diesel emissions requirements while helping deliver improvements to horsepower, torque, towing, hauling, reliability and fuel efficiency.

What is Diesel Exhaust Fluid(DEF)?  A non-hazardous clear fluid (67% deionized water and 33% chemically pure urea) that is injected into the diesel exhaust system to greatly reduce NOx emissions.

Where is the DEF fill nozzle and tank?  On pickups, they are located together with the fuel tank and fill nozzle on the driver’s side.  This location may vary on Chassis Cabs.

How large is the DEF tank?  Pickups have a 5.1-gallon tank, Chassis Cabs have a 6.1-gallon tank.

Where do I get a DEF?  Available from dealerships, major auto parts chains and gas stations.  Customers can purchase Motocraft DEF in 1-and 2.5-gallon jugs.

How much does DEF cost?  Suggested list price of Motorcraft DEF is $5-$10 a gallon, depending on quantity purchased.  Refilling is typically only required at oil change intervals, depending upon vehicle usage, and the fuel economy savings greatly outweigh this cost.

How do I know when to refill DEF?  Adding DEF is as simple as adding washer fluid, and Super Duty provides numerous warnings that the tank is getting low starting at 800 miles to empty.

What happens if I run out of DEF?  Drivers will have plenty of warning long before entering the required speed-limited modes that occur once the tank is empty.  This eventually progresses to an idle-only mode.

Can I use water or anything other than DEF?  No. The system will sense that the DEF has been contaminated and enter a speed-limited mode until it is remedied.

What if the DEF freezes in the tank?  The tank and supply lines are heated and allow for expansion.  You can start the engine and drive while the DEF thaws.

Related articles

• 2011 Ford Super Duty Questions and Answers (beechmontfordblog.com)

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