American Petroleum Institute

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November 22, 2016

New API Diesel Engine Oil Categories Arrive Dec. 1

The American Petroleum Institute's new diesel engine oil-service categories, API CK-4 and FA-4, will begin appearing in the marketplace on Dec. 1.

May 18, 2016

API Debuts Symbols for Identifying New Diesel Oils

The American Petroleum Institute is introducing a special Service Symbol Donut designed to help buyers differentiate between the new API FA-4 and CK-4 service categories for diesel-engine oils.

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