Pontiac 1998 Firebird Owner's Manual page 268

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RECOMMENDED SAE VISCOSITY GRADE ENGINE OILS
FOR BEST FUEL ECONOMY AND COLD STARTING, SELECT THE
LOWEST
SAE VlSCOSlTV GRADE OIL
FOR
THE EXPECTED TEMPERATURE RANGE.
HOT
WEATHER
LOOK
FOR THIS
SYMBOL
SAE
i w -
3 0
PREFERRED
WEATHER
DO NOT USE SAE 2OW-50
OR
ANY OTHER
GRADE
OIL NOT RECOMMENDED
5 . 7 L
V8 Engine
As shown in the chart, if you have the 5.7L engine,
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.
6-15

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