Engine Oil Licensing and Certification System API 1509 NINETEENTH EDITION, JANUARY 2021 Engine Oil Licensing and Certification System Downstream Segment API 1509 NINETEENTH EDITION, JANUARY 2021 Special Notes API publications necessarily address problems of a general nature. With respect to particular circumstances, local, state, and federal laws and regulations should be reviewed. Neither API nor any of API's employees, subcontractors, consultants, committees, or other assignees make any warranty or representation, either express or implied, with respect to the accuracy, completeness, or usefulness of the information contained herein, or assume any liability or responsibility for any use, or the results of such use, of any information or process disclosed in this publication. Neither API nor any of API's employees, subcontractors, consultants, or other assignees represent that use of this publication would not infringe upon privately owned rights. API publications may be used by anyone desiring to do so. Every effort has been made by the Institute to assure the accuracy and reliability of the data contained in them; however, the Institute makes no representation, warranty, or guarantee in connection with this publication and hereby expressly disclaims any liability or responsibility for loss or damage resulting from its use or for the violation of any authorities having jurisdiction with which this publication may conflict. API publications are published to facilitate the broad availability of proven, sound engineering and operating practices. These publications are not intended to obviate the need for applying sound engineering judgment regarding when and where these publications should be utilized. The formulation and publication of API publications is not intended in any way to inhibit anyone from using any other practices. Any manufacturer marking equipment or materials in conformance with the marking requirements of an API standard is solely responsible for complying with all the applicable requirements of that standard. API does not represent, warrant, or guarantee that such products do in fact conform to the applicable API standard. All rights reserved. No part of this work may be reproduced, stored in a retrieval system, or transmitted by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission from the publisher. Contact the Publisher, API Publishing Services, 200 Massachusetts Avenue, NW, Suite 1100, Washington, DC 20001. Copyright ©2021 American Petroleum Institute Foreword This publication describes the voluntary API Engine Oil Licensing and Certification System (EOLCS) and is intended to explain to marketers how the API Engine Oil Quality Marks are licensed and displayed for the consumer. The publication describes methods for developing new engine oil performance standards and provides the marketer with a description of the API Marks and their use, licensing requirements, aftermarket conformance, and enforcement procedures. It also explains the interaction and roles of the various independent organizations that are part of the API EOLCS. API publications may be used by anyone desiring to do so. Every effort has been made by the Institute to assure the accuracy and reliability of the data contained in them; however, the Institute makes no representation, warranty, or guarantee in connection with this publication and hereby expressly disclaims any liability or responsibility for loss or damage resulting from its use or for the violation of any federal, state, or municipal regulation with which this publication may conflict. Suggested revisions are invited and should be submitted to the Standardization Director, American Petroleum Institute, 200 Massachusetts Avenue, NW, Suite 1100, Washington, DC 20001. Changes since 18th edition Extensive renumbering has occurred. This is an outcome of the desire to maximize the automation of renumbering for later editions, including sections/paragraphs, tables, footnotes and figures. Cross-referencing has also been implemented. A new Table of Contents has been developed. The introduction of Annex T, which includes CK-4 and FA-4 specifications, has required the addition of new ASTM test methods to Section 2 (Normative References). Contents 1. SCOPE ....................................................................................................................