Jeffrey Harmening

American Petroleum Institute Jeff Harmening

Jeffrey Harmening is manager, Engine Oil Licensing and Certification System, diesel exhaust fluid and Motor Oil Matters, American Petroleum Institute.

From the Author
Sustainability
How High-Quality Diesel Exhaust Fluid Keeps Trucks Running Smoothly
Here are some tips for drivers on the road and for shop owners to purchase high-quality DEF in a safe manner and to handle and store during warm weather months.
Stock Oil And Gas
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