Pontiac 2003 Bonneville Owner's Manual page 278

RECOMMENDED SAE VISCOSITY GRADE ENGINE OILS
FOR BEST FUEL ECONOMY AND COLD STARTING, SELECT THE LOWEST
SAE VISCOSITY GRADE OIL FOR THE EXPECTED TEMPERATURE RANGE.
HOT
WEATHER
+
80
~
+
60
."I
7
"C
t
38
f
21
t
16
+ 4
- 7
18
COLD
WEATHER
~
1 '
/.
SAE~W-XI
LOOK
FOR THIS
SYMBOL
.-
SAE
1OW-30
PREFERRED
above 0°F
(-1WC)
DO NOT USE SAE 2OW-50 OR ANY OTHER
GRADE OIL NOT REGOMMEMBED
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 of extreme cold, where the
temperature falls below -20°F (-29°C) it is
recommended that you use 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.
Engine Oil Additives
Don't add anything to your oil. The recommended oils
with the starburst symbol are all you will need for
good performance and engine protection.
5-1 9