Diesel Exhaust Fluid

At Kellerstrass Oil, we are proud to now offer Diesel Exhaust Fluid (DEF) to our customers. 

What Exactly is DEF and How Does it Work?

DEF is a mixture of high purity synthetic urea and purified water, used in Selective Catalytic Reduction (SCR) systems on diesel engines. SCR is a leading technology that meets the 2010 EPA mandate to reduce levels of oxides of nitrogen (NOx) emitted from diesel engines. SCR systems use diesel exhaust fluid and a catalytic converter to significantly reduce NOx emissions. DEF is a nontoxic, nonpolluting, nonhazardous and nonflammable solution. It is carried on board SCR-equipped vehicles in a designated tank. Small quantities of diesel exhaust fluid are injected into the exhaust stream to mix with exhaust gases to form harmless nitrogen and water.

For the SCR system to operate properly, the vehicle’s diesel exhaust fluid level needs to be replenished periodically, like fuel, but not as often. Many manufacturers recommend that the DEF tank be filled at the same time as the oil change service interval, but DEF usage does vary by drive cycles and by vehicle.

How Often to Replace DEF

Warnings will display on the instrument panel when the DEF level is getting low and should be refilled. You will lose noticeable horsepower if the DEF level gets too low. DEF must be added to the designated tank to resume normal power.

Benefits of DEF

Diesel exhaust fluid significantly reduces NOx emissions, known to be harmful to our health and the environment.

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