The API Certification Mark "starburst" is designed to identify engine oils recommended for a specific application (such as gasoline service). An oil may be licensed to display the starburst only if the oil satisfies the most current requirements of the International Lubricant Standardization and Approval Committee (ILSAC) minimum performance standard for this application (currently GF-2 for passenger cars).
Here's the link: http://www.bullittarchive.com/Maintenance/Oil/
Here's the link: http://www.bullittarchive.com/Maintenance/Oil/