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.
File Size: 3.00 MB
Current complete edition, includes Annexes E/F. For your convenience, see below links for extracted versions of each.
File Size: 520 KB
File Size: 401 KB