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Bill O’Ryan

Bill O'ryan Api

Bill O’Ryan is senior manager of EOLCS/DEF at the American Petroleum Institute (API).

From the Author
Diesel Engines
Maintain Your Diesel Truck with Quality DEF
American Petroleum Institute
Handling and storing DEF can be challenging in wintertime for drivers on the road and those storing it in a garage or shop
The quality of the DEF used in your truck is as vital as the quality of the engine oils or fuels.
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