Buick 2000 Park Avenue Owner's Manual page 277

As shown in the chart, SAE 10W
vehicle. However, you can use SAE 5W
_
to be colder than 60 F (16
change. When it's very cold, you should use SAE
-
5W 30. 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.
R
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
synthetic oil or an SAE 0W
easier cold starting and better protection for your engine
at extremely low temperatures.
-
30 is best for your
-
30 if it's going
_
C) before your next oil
-
30
-
30 oil. Both will provide
6-15