API 1509:2002 Engine Oil Licensing and Certification System

American Petroleum Institute (API). Fifteenth Edition, April 2002. 84p. This publication describes the API Engine Oil Licensing and CertiÞcation System (EOLCS), a voluntary licensing and certiÞcation program designed to deÞne, certify, and monitor engine oil performance deemed necessary for satisfactory equipment life and performance by vehicle and engine manufacturers. Engine oil marketers that meet EOLCS requirements may be licensed to display two Marks, the API Service Symbol and the API CertiÞcation Mark.