GMC 1994 Yukon Owner's Manual page 263

I
NOTICE:
Don't add too much oil. If your engine has so much oil that the
oil level gets above the upper mark that shows the proper
operating range, your engine could be damaged.
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.
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