Buick PARKAVENUE 1994 Manual page 243

As shown in the chart, SAE 1OW-30 is best for your
.vehicle. However, you can use SAE 5W-30 if it's going
to be colder than 60°F (16°C) before your next oil
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 1OW-40 or SAE 2OW-50.
If you cannot find oils with the new "starburst" symbol
on the front of the container, you should look for and
use oils containing the following three things:
0
0
0
SH or SG
"SH" or "SG" must be on the oil container, either by
itself or combined with other quality designations,
such as "SH/CD," "SH,SG,CD," "SG/CD" etc.
These letters show American Petroleum Institute
(API) levels of quality.
SAE 1OW-30
Energy Conserving I1
Oils with these words on the container will help you
save fuel.
These three things are usually included in a doughnut
shaped logo (symbol) on most containers. If you cannot
find oils with the "starburst" symbol, you should look
for oils with the doughnut shaped symbol, containing
the three things noted above.
NOTICE:
If
you use oils that do not have either the
"starburst" symbol or an API
SH
or
SG
designation, you can cause engine damage not
covered by your warranty.
GM Goodwrench@ oil (in Canada, GM Engine Oil)
meets all the requirements for your vehicle.
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