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API 1509 Documents

API 1509 describes the voluntary API Engine Oil Licensing and Certification System (EOLCS) and explains to marketers how different API marks are licensed and displayed for the consumer. The current edition of API 1509 is now available and can be downloaded in pdf format. 

Downloads

API 1509, Engine Oil Licensing and Certification System, 19th Edition, January 2021

File Size: 1.6 MB

Current complete edition, includes Annexes E/F