Engine Oil Additives; When To Change Engine Oil - GMC 1999 Savana Van Owner's Manual

As shown in the chart, SAE 5W
vehicle. However, you can use SAE 10W
_ _
-
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
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 R 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 0W
will provide easier cold starting and better protection
for your engine at extremely low temperatures.
-
30 is best for your
-
30 if it's going
-
50.
-
30 oil. Both

Engine Oil Additives

Don't add anything to your oil. Your dealer is ready to
advise if you think something should be added.

When to Change Engine Oil

If any one of these is true for you, use the short trip/city
maintenance schedule:
D
Most trips are less than 5 to 10 miles (8 to 16 km).
This is particularly important when outside
temperatures are below freezing.
D
Most trips include extensive idling (such as frequent
- -
driving in stop and go traffic).
D
Most trips are through dusty areas.
D
You frequently tow a trailer or use a carrier on top of
your vehicle.
D
The vehicle is used for delivery service, police, taxi
or other commercial application.
Driving under these conditions causes engine oil to
break down sooner. If any one of these is true for your
vehicle, then you need to change your oil and filter
every 3,000 miles (5 000 km) or 3 months
occurs first.
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whichever
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