Engine Oil Additives; When To Change Engine Oil - GMC 1996 Sonoma Owner's Manual

As shown in the chart, SAE 5W-30 is best for your
vehicle. However, you can use SAE 10W-30 if it's going
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-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.
Engine Oil Additives
Don't add anything to your oil. Your G M dealer is ready
to advise if you think something should be added.
When to Change Engine Oil
See if any one of these is true for you:
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0
0
0
0
Most trips are less than 5 to 10 miles (8 to 16 km).
This is particularly important when outside
temperatures are below freezing.
Most trips include extensive idling (such as frequent
driving in stop-and-go traffic).
You operate your vehicle in dusty areas or off-road
frequently.
You frequently tow a trailer.
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 -- whichever
occurs first.
I f none of them is true, change the oil and filter every
7,500 miles (1 2 500 km) or I2 months -- whichever
occurs first. Driving a vehicle with a fully warmed
engine under highway conditions causes engine oil to
break down slower.
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