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  About Diesel Exhaust Fluid (DEF)

In 2010, cars and trucks with diesel engines sold in the United States must meet stringent new U.S. Environmental Protection Agency (EPA) emissions requirements. To meet these requirements, many diesel engine manufacturers have decided to use Selective Catalytic Reduction (SCR), an emissions aftertreatment technology that converts nitrogen oxides (NOx) in the diesel-engine exhaust stream into nitrogen and water vapor, two natural components in the air we breathe.

While SCR technology is not new, its use in trucks and cars in North America is new. SCR converts NOx to nitrogen and water vapor using a catalyst, the heat from the exhaust, and a diesel exhaust fluid (DEF). The fluid, for cars and trucks typically a solution of urea and water, is injected into the diesel exhaust stream, and the heat from the exhaust, the fluid, and the catalyst convert the NOx into the harmless gases.

For the SCR unit to operate properly, the diesel exhaust fluid must meet an exacting performance standard. This standard, published by the International Organization for Standardization (ISO), is intended to ensure that the diesel exhaust fluid used in SCR-equipped cars and trucks provides the performance required by diesel engine manufacturers.

API Certified

Carson Oil is certified by the American Petroleum Institute. This voluntary certification program authorizes diesel exhaust fluid marketers that meet specified requirements to use the API Diesel Exhaust Fluid Certification Mark. This Mark identifies diesel exhaust fluid marketers that have certified that they meet ISO performance requirements.

For more information on the American Petroleum Institute and its diesel exhaust fluid certification program, visit      
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