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GMC 1998 Sonoma Owner's Manual page 263

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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 change your own
oil, be 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 ail 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:
RECOMMENDED SAE VlSCOSlTV GRADE ENGINE OILS
SELECT THEiOWEST
SA€ VISCOSITY GRADE OIL FOR THE EXPECTED TEMPERATURE RANGE.
~.
.
.
. .
HOT
WEATHER
LOOK
FOR
MIS
SYMBOL
DO NOT USE
SAE 2ow-50
OR ANY OTHER
GRADE OIL NOT RECOMMENDED
6-13

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