Buick 1998 Century Owner's Manual page 273

RECOMMENDED SAE VlSCOSlTT GRADE ENGINE OILS
FOR BEST FUEL ECONOMY AND COLU STARTING, SELECT THE LOW
SAE VISCOSITY GRADE
OIL
FOR THE EXPECTED TEMPERATURE RANGE.
HOT
WEATHER
I
+
100..
I
l
j
+27
-
+ 16
-
+ 4
-
- 7
i ,
SAE
Sw-30
,
' ; ;
I
PREFERRED
LOOK
FOR MIS
SYMBOL
COLD
WEATHER
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
O
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.
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