Guide to 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 produced, urea in de-mineralized water. It is located in a separate tank on the vehicle, and is easy to deal with, non-toxic and safe for use. Diesel Exhaust Fluid (DEF) consumption is computed as a ratio of diesel fuel use, also called as the “dosing rate” or “treat rate”. Medium- and heavy-duty vehicles generally have a dosing rate of 2-3%. Here are some of the most important things that you should know about diesel exhaust fluid.
Who Uses DEF?
Most diesel-powered on-road vehicles manufactured since 2010 employ 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 critical. One essential aspect in maintaining DEF purity and quality is the kind of dispensing system used. Closed system containers have a valve coupling system that protects the container opening on drums and totes (IBC) to prevent debris, dirt, bugs, etc from getting into the container and contaminating the DEF. On the other hand, open system containers are drums or totes that do not feature a valve insert in the container’s opening, which signifies that dirt or debris can get into the container and contaminate the 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 usually have a DEF pump right on the fuel island. You can also purchase DEF at most OEM locations, as well as other dealers and distributors.
Running Out of DEF
The EPA orders all truck manufacturers to provide some kind of staged warning system (some include actual gauges) to inform the driver about precisely how close to empty the system is. Whether a vehicle goes into a “limp home” or decreased engine power or restrains the number of times you can turn the engine on will be reliant on the actual car or truck model, but at some point it will not start. To put it simply, you should treat your DEF tank the same way you treat your fuel tank; you surely do not want to leave yourself stranded because you failed to notice the indicators.