When choosing oil for your vehicle, you should always look or ask for API-licensed oil. API has made it easy to find these oils: licensed oils display one or both of the API motor oil quality marks—the API Service Symbol "Donut" and the Certification Mark "Starburst." These marks are part of API's Engine Oil Licensing and Certification System (EOLCS), a voluntary licensing and certification program that authorizes engine oil marketers meeting API requirements to display the API quality marks.
The API "Donut" identifies oils that meet current API engine oil standards. It includes the SAE viscosity grade of the oil, API standards met by the oil, and other important performance parameters.
The API "Starburst" signifies oils which meet the latest International Lubricant Specification Advisory Committee (ILSAC) standard, currently designated ILSAC GF-6A. The ILSAC standards are developed by vehicle and engine manufacturers, oil and additive companies and industry trade associations such as API, ACC, ASTM and SAE. These oils provide engine protection while also delivering improved fuel economy and emission system protection.
The API "Shield" signifies oils which meet the current ILSAC GF-6B engine protection standard and fuel economy requirements of the International Lubricant Specification Advisory Committee (ILSAC). Note: This mark can only be applied to oils having a viscosity grade of 0W-16.
To learn more about API's EOLCS program and quality marks visit API's website.