• Coming Soon: A fresh look for an industry that’s always innovating •
Skip to main content
  1. Home
  2. Products & Services
  3. Engine Oil (EOLCS)
  4. Documents
  5. API 1509 Documents

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, 18th Edition, June 2019

File Size: 1.6 MB

Current complete edition

Portuguese Translation: API 1509, Engine Oil Licensing and Certification System, 18th Edition, June 2019

File Size: 3.0 MB

Current complete edition


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

File Size: .6 MB

New items are shown in red and deleted items in strikeout

Certification Directories

Free directories listing all of the participants in our certification-related programs.

View All

Get a Quote

Request a Quotation.

Get a Quote

Related Products

API Learning

Through multi-platform and multi-media eLearning, API’s Training Program offers comprehensive training developed by experts on API Standards and Recommended Practices.

Motor Oil Matters (MOM)

The MOM mark helps customers identify distributors and oil change locations committed to providing motor oil meeting the performance standard recommended by most vehicle and engine manufacturers.

API Compass/Subscriptions

The Compass platform provides organization-wide access to all the API standards and specifications needed to ensure safety, compliance and interoperability.