What Kind Of Engine Oil To Use - GMC SIERRA CK2 1999 Owner's Manual

What Kind of Engine Oil to Use

Oils recommended for your vehicle can be identified by
looking for the "Starburst" symbol. This symbol
indicates that the oil has been certified by the American
Petroleum Institute (API). Do not use any oil which
does not carry this Starburst symbol.
If you have your oil changed for you, be sure the oil put
into your engine is American Petroleum Institute
certified for gasoline engines.
You should also use the proper viscosity oil for your
vehicle, as shown in the following chart:
If you change your own oil,
be sure you use oil that has
the Starburst symbol on the
front of the oil container.
yellowblue
6-15