1994 GMC Suburban Owner's Manual - Page 263

I NOTICE: Don't add too much oil. If your enginehas so much oil that the oil level gets above the upper mark that shows the proper operating range, your engine could damaged. be The engine oil filler cap is located on the driver's side engine valve cover. Just fill it enough to put the level somewhere in the proper operating range. Push the dipstick all the way back in when you're through. What Kind of Oil to Use Beginning midyear 1993, oils of the proper quality for your vehicle will be identified with this new "starburst" symbol.The "starburst" symbol indicates that the oil has been certified by the American Petroleum Institute (API), and is preferred for use in your gasoline engine. 6-17