Engine Oil Licensing and Certification System API 1509 EIGHTEENTH EDITION JUNE 2019(amended July 10 2019) energy AMERICAN PETROLEUM INSTITUTE Engine Oil Licensing and Certification System Downstream Segment API 1509 EIGHTEENTH EDITION JUNE 2019 energy AMERICAN PETROLEUM INSTITUTE 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 mittees or other assignees make any warranty or representation either express or implied with respect to the accuracy pleteness 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...