Engine Oil

Engine Oil Licensing and Certification System (EOLCS)

API’s Engine Oil Licensing and Certification System (EOLCS) is a voluntary licensing and certification program that authorizes engine oil marketers who meet specified requirements to use the API Engine Oil Quality Marks.

API's Engine Oil Quality Marks—the API Service Symbol "Donut" and Certification Mark "Starburst"—help consumers identify quality engine oils for their gasoline- and diesel-powered vehicles.

API Announces Discontinuation of API CG-4 Specification
See ‘What’s New’ page for further information

Contact:
E-mail: eolcs@api.org
Phone: 202-682-8516
Fax: 202-962-4739