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, 17th Edition, Addendum 1 (October 2014 with Errata March 2015)

File Size: 1.6 MB

Current complete edition

API 1509 Addendum 2, 17th Edition, September 2012 (Addendum 1 October 2014)

File Size: .4 MB

API CK-4 and FA-4 Standards

API 1509 Addendum 3, Engine Oil Licensing and Certification System 17th Edition, September 2012 (Addendum 1 October 2014)

File Size: .5 MB

API CK-4 and FA-4 Service Symbol instructions

API 1509 Addendum 4, Engine Oil Licensing and Certification System 17th Edition, September 2012 (Addendum 1 October 2014)

File Size: .5 MB

Changes to Annex G tables

API 1509 Addendum 5, Engine Oil Licensing and Certification System 17th Edition, September 2012 (Addendum 1 October 2014)

File Size: 400 Kb

Resource Conserving requirements for SAE 0W-16 oils

API 1509 Addendum 6, Engine Oil Licensing and Certification System 17th Edition, September 2012 (Addendum 1 October 2014)

File Size: .6 MB

Addition of Sequence IIIH test to API SN requirements

API 1509 Addendum 7, Engine Oil Licensing and Certification System 17th Edition, September 2012 (Addendum 1 October 2014)

API SN with SN Plus

API 1509 Annex E-API Base Oil Interchangeability Guidelines for Passenger Car Motor Oils and Diesel Engine Oils (April 2019) (Revised May 2019)

File Size: .6 MB

New items are shown in red and deleted items in strikeout

API 1509 Annex F-API Guidelines for SAE Viscosity-Grade Engine Testing (April 2019) (Revised May 2019)

File Size: .6 MB

New items are shown in red and deleted items in strikeout