GMC SIERRA 1997 Manual page 293

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RECOMMENDED
SAE
YlSCOSlTT GRADE ENGINE OILS
I
FOR BEST FUEL ECONOMY AND COLD STARTING, SELECT THE LOWEST
SAL VISCOSITY GRADE OIL FOR THE EXPECTED TEMPERATURE RANGE.
I
HOT
WEATHER
COLD
WEATHER
SAE
5w-30
PREFERRED
LWK
F m
THIS
SYMBOL
DO NOT USE SAE 2ow-50 OR ANY OTHER
GRADE OIL NOT RECOMMENDED
As shown in the chart, SAE 5W-30 is best for your
vehicle. However, you can use SAE 1OW-30 if it's going
to be
0°F
(-
18°C) or above. These numbers on an oil
container show its viscosity, or thickness.
Do
not use
other viscosity oils, such
as SAE 20W-50.
NOTICE:
Use only engine oil with the American Petroleum
Institute Certified For Gasoline Engines
"Starburst" symbol. Failure to use the
recommended oil can result in engine damage
not covered by your warranty.
GM Goodwrench@ oil meets all the requirements for
your vehicle.
If you are in an area where the temperature falls below
-20°F (-29"C), consider using either an SAE 5W-30
synthetic oil or an SAE
OW-30
oil. Both will provide
easier cold starting and better protection for your engine
at extremely low temperatures.
6-17

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