DEF Info

Principle-driven with a focus on excellence, RKA Petroleum provides quality products, superior customer service, and maintains the highest standards in the petroleum industry.

Diesel Exhaust Fluid  (DEF) is a high purity automotive grade solution containing 32.5% urea and 67.5% de-ionized water used as a reductant  in the selective catalytic reduction control systems on new 2010 model diesel vehicles. Automotive grade urea is a non-hazardous and nontoxic nitrogen-based compound used in a wide range of applications from fertilizers, skin creams, pharmaceuticals and animal feeds. 

DEF Frequently Asked Questions

What is the mileage range for a tank of DEF?
Mileage depends on the application, fuel consumption and tank size. DEF usage is gauged between 2-3% of diesel usage and the largest OEM DEF tank size can provide a 4,000 mile travel range.

How will I know that the DEF product I purchase will work?
A key factor to insuring DEF quality is only purchasing American Petroleum Institute (API) certified DEF. The API symbol on packaging guarantees the product meets the required International Organization for Standardization ISO 22241-1 and AUS – 32 specifications. This will ensure the proper purity and concentration (32.5%) of urea. For more information on these specifications, visit

Are there special storage requirements for DEF?
DEF should be stored in a cool, dry, well-ventilated area, out of direct sunlight. Ideal storage temperature is up to 77 deg F (25 deg C), temporary exposure to higher temperatures has little to no impact on the quality of DEF.

Should I be concerned about handling DEF?
No. DEF is a nontoxic, nonpolluting, non-hazardous and nonflammable solution. It is stable, colorless, and meets accepted international standards for purity and composition. DEF is safe to handle and store and poses no serious risk to humans, animals, equipment or the environment when handled properly. Contact RKA for MSDS sheet.

What measures have been put in place to prevent diesel from being pumped into the DEF tank?
The standard nozzle diameter for dispensing DEF has been designed at 19mm versus the standard diesel fuel nozzle diameter, which is 22mm. In addition, the tank cap for the DEF tank will be blue to further differentiation from the diesel tank.

RKA has the experience to perform, the dedication to care and the commitment to serve. With our wide array of DEF solutions for your needs.

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our heritage

  • 1950’s-1970’s

    Hilmer Westphal Leemon started the Leemon Oil Company as a home heating oil delivery service with Pure Oil Company. Soon he expanded the business by adding a gas station and a small oil distribution plant in suburban Detroit.

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  • 1970’s-2000’s

    Roger K Albertie assumes control of the family business. Under his leadership and guidance RKA Petroleum expands into a multifaceted distributor supplying gasoline, diesel, jet and alternative fuels to local national and government agencies in over 29 states.

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  • Today

    RKA continues to grow and prosper under the leadership of third generation family members who are dedicated to meeting the challenges of today’s market while maintaining the RKA principals of quality and service to customers, that have been the mainstay of RKA’s success for over 60 years.

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