GMC 1994 Sonoma Owner's Manual page 228

I
NOTICE:
Don't add too much oil. If your engine has so much oil that the
oil level gets above the cross-hatched area that shows the proper
operating range, your engine could be damaged.
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
1
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 perferred for use in your gasoline engine.
You should look for this on the front of the oil container, and use only oils
that display this new symbol.
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