This SAE Standard outlines the engine oil performance categories and classifications developed through the efforts of the Alliance of Automobile Manufacturers (Alliance), American Petroleum Institute (API), the American Society for Testing and Materials (ASTM), the Engine Manufacturers Association (EMA), International Lubricant Specification Advisory Committee (ILSAC) and SAE. The verbal descriptions by API and ASTM, along with prescribed test methods and limits are shown for active categories in Table 1 and obsolete categories in Table A1. Appendix A is a historical documentation of the obsolete categories. For purposes of this document, active categories are defined as those (a) for which the required test equipment and test support materials, including reference engine oils and reference fuels, are readily available, (b) for which ASTM or the test developer monitors precision for all tests, and (c) which are currently available for licensing by API EOLCS. The current processes for initiating new classifications were developed through the cooperative efforts of the Alliance, API, ASTM, EMA, ILSAC, and SAE. New ILSAC classifications are developed using the procedure defined in API 1509 Appendix C. New API “C” categories are added using the procedure defined in API 1509 Appendix D. New API “S” categories are added by the API Lubricants Group.
This revision of SAE J183 incorporates the latest changes to the API Engine Oil Licensing and Certification System (EOLCS) for gasoline and diesel engine oils, and the International Lubricant Specification Advisory Committee (ILSAC) (formerly International Lubricant Standardization and Approval Committee) Standards for Passenger Car Engine Oils. Additionally, the latest ASTM methods have been included, and the Appendix has been expanded to include those oil performance categories that have since become obsolete. The information contained within this revision is very important to those interested in the identification and comparison of the critical factors important to each classification as well as for their eventual utilization.