API PUBL 1520-1996 Directory of Licensees: API Engine Oil Licensing and Certification System Including Brand Products Authorized to Display the Engine Oil Licensing and Certification Symbols
1996API PUBL 1520-1996 Directory of Licensees: API Engine Oil Licensing and Certification System Including Brand Products Authorized to Display the Engine Oil Licensing and Certification Symbols
1995API PUBL 1520-1995 Directory of Licensees: API Engine Oil Licensing and Certification System Including Brand Products Authorized to Display the Engine Oil Licensing and Certification Symbols
1994API PUBL 1520-1994 API Engine Oil Licensing and Certification System: 1994 Licensees Including Brand Products Authorized to Display the Engine Oil Licensing and Certification Symbols
1993API PUBL 1520-1993 API Engine Service Classification System: 1993 Licensees - including Brand Products Authorized to Display the Engine Service Classification System Symbol