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.
Can I make DEF myself?
We don’trecommend you to make DEF yourselves. DEF has strict requirements for maintaining concentration and purity of ingredients that is critical to the proper functioning and longevity of the SCR system. OEMs require that DEF used with their SCR systems meet all ISO22241 specifications as well as API (American Petroleum Institute) certification requirements. It is recommended that end users purchase certified DEF and avoids blending it themselves. For more information about the quality standards, refer to ISO22241, which details specifications for DEF quality, handling, testing, transportation storage, and refilling.
What happens to my truck if I run out of DEF?
The EPA requires all truckmakers to incorporate some type of staged warning system (some offer actual gauges) to let the driver know exactly how close to empty the system is. Whether a vehicle goes into a "limp home" or reduced engine power or limits the number of times you can turn the engine on will depend on the specific car or truck, but at some point it will not start. Simply put, you should treat your DEF tank the same way you treat your fuel tank; you don't want to leave yourself stranded by ignoring the warnings.
How can I maintain my diesel engine?
Try CARBON CLEANING!
Hydrogen gas is very efficient for this kind of engine.
Preventive engine cleaning enables you to restore engine parts rather than replacing them, thereby saving vehicle owners on costly parts, such as a new turbocharger (1.350€ - 3.100€), catalytic converter (600€ - 2.000€), DPF (600€ - 2.000€) or EGR valve (370€ - 500€).
These problems result mainly from poor combustion, which stifles the engine.
So before replacing your engine parts, try Carbon Cleaning. A dirty engine as the result of carbon deposits is the new threat to vehicle performance.
The shelf life of DEF is a function of ambient storage temperature. DEF will degrade over time depending on temperature and exposure to sunlight. Expectations for shelf life as defined by ISO Spec 22241-3 are the minimum expectations for shelf life when stored at constant temperatures. If stored between 10 and 90 deg F, shelf life will easily be one year. If the maximum temperature does not exceed approximately 75 deg F for an extended period of time, the shelf life will be two years.
You can't get DEF fluid anywhere
As you might expect, truck stops are likely to carry several brands of DEF, sometimes in multi gallon containers or available at the pump. Here are just a few places we've found that carry DEF: Walmart, TravelCenters of America, Flying J Truck Stops, Love's Travel Stops, Petro Stopping Centers, and Pilot Travel Centers. Plus, you can purchase it by the gallon at many auto parts stores like O'Reilly's and Advance Auto.
How much can I expect to pay for Diesel Exhaust Fluid (DEF)?
The price of Diesel Exhaust Fluid (DEF) will depend on your location, supply method and the volume of fluid that you purchase. Packaged supply, which comes in 1, 2.5 and 4 gallon jugs, is the most expensive method on a per-gallon basis, followed by 55 gallon drums and 275 or 330 gallon totes. Bulk volumes, which are delivered directly to fleet terminals, are the cheapest way to buy DEF. DEF can also be bought at the pump from Pilot Flying J, Love's Travel Stops and other truck stop chains. The cost saving of moving from truck stop to tote supply is approximately 30%.
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