Vehicles: 10 Mistakes that Most People Make

Guide to Diesel Exhaust Fluid

Diesel Exhaust Fluid (DEF) is what we call the high quality operating fluid that is used jointly 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 filled into a separate tank on the car, and is simple to manage, non-toxic and safe for use. Diesel Exhaust Fluid (DEF) consumption is calculated as a ratio of diesel fuel use, also referred to as the “dosing rate” or “treat rate”. Medium- and heavy-duty vehicles normally have a dosing rate of 2-3%. Below are a few of the most essential things that you must know about diesel exhaust fluid.

Functions of DEF

Majority of the diesel-powered on-road vehicles manufactured since 2010 make use of SCR technology and require DEF. Several 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.

Maintaining DEF Purity

DEF purity is crucial. 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. By contrast, open system containers are drums or totes that do not include a valve insert in the container’s opening, which means that dirt or debris can infiltrate the container and contaminate the DEF.

Purchasing DEF

Due to the fact that almost all diesel-powered passenger cars and trucks made since 2010 are equipped with Selective Catalytic Reduction (SCR) and require DEF, it is available to be purchased 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.

DEF Warning System

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.

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