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What You Need to Know about Diesel Exhaust Fluid

Diesel Exhaust Fluid (DEF) refers to a high quality operating fluid that is employed in combination with diesel vehicles and selective catalytic reduction (SCR) technology. It is a 32.5% solution of high-purity, synthetically manufactured, urea in de-mineralized water. It is placed into a separate tank on the truck, and is simple to handle, non-toxic and safe for use. Diesel Exhaust Fluid (DEF) consumption is quantified as a ratio of diesel fuel use, also known as the “dosing rate” or “treat rate”. Medium- and heavy-duty vehicles generally have a dosing rate of 2-3%. Below are a few of the most essential things that you must know about diesel exhaust fluid.

Who Uses DEF?

Nearly all diesel-powered on-road vehicles manufactured since 2010 utilize SCR technology and require DEF. A few examples are heavy-duty trucks, diesel pick-ups, delivery vans, and European luxury cars. Diesel powered off-road equipment like those used for agricultural and construction has been mandated to use SCR technology since 2014.

Keeping DEF Pure

DEF purity is vital. One important consideration in keeping DEF purity and quality is the kind of dispensing system utilized. Closed system containers feature a valve coupling system that fortifies the container opening on drums and totes (IBC) to prevent debris, dirt, bugs, etc from coming into the container and contaminating the DEF. Contrastingly, open system containers are drums or totes that do not have a valve insert in the container’s opening, which implies that dirt or debris can get into the container and pollute the DEF.

Buying DEF

In view of the fact that nearly all diesel-powered passenger cars and trucks produced since 2010 are provided with Selective Catalytic Reduction (SCR) and require DEF, it is available for purchase at most fueling stations. Truck stops also typically have a DEF pump right on the fuel island. You can also find DEF at most OEM stores, as well as other dealers and distributors.

DEF Warning System

The EPA directs all truck manufacturers to include some type of staged warning system (some provide actual gauges) to let the the driver be aware about exactly how near to empty the system is. Whether a vehicle goes into a “limp home” or diminished engine power or restricts the number of times you can turn the engine on relies on the particular car or truck model, but at some point it will not start. In a nutshell, you should treat your DEF tank the same way you treat your fuel tank; you certainly do not want to leave yourself stranded because you disregarded the indicators.