Everything You Should Know about Diesel Exhaust Fluid

Diesel Exhaust Fluid (DEF) is the term for a high quality operating fluid that is utilized together 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 such as the ones used for agricultural and construction purposes has been obliged to use SCR technology since 2014.

How to Maintain DEF Purity

DEF purity is vital. One essential aspect in maintaining DEF purity and quality is the kind of dispensing system used. Closed system containers involve a valve coupling system that secures the container opening on drums and totes (IBC) to prevent debris, dirt, bugs, etc from gaining access to 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.

Where to Find DEF?

Owing to the fact that majority of diesel-powered passenger cars and trucks manufactured since 2010 are furnished with Selective Catalytic Reduction (SCR) and require DEF, it is can easily be bought 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.

Running Low on 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 lower engine power or constrains the number of times you can turn the engine on will be dependent on the specific 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.