GMC 1995 Jimmy Owner's Manual page 250

What Kind of Oil to Use
Oils
of
the proper quality for
your
vehicle
can
be identified by looking for
the "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.
If you
change your own oil,
B e
sure
YOU
use oil that has the "Starburst"
symbol on the front of the oil container. If
you
have your oil changed for
you, be sure the oil put into your engine is American Petroleum Institute
certified for gasoline engines.
6- 10