GMC 2003 C4C042, Owner'S Manual

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Engine Oil Additives
Don’t add anything to your oil. The recommended oils
with the API service symbol are all you will need for
good performance and engine protection.
When to Change Engine Oil
Change engine oil and filter every 10,000 miles
(16 000 km) or every 12 months, whichever occurs first.
What to Do with Used Oil
Used engine oil contains certain elements that may be
unhealthy for your skin and could even cause cancer.
Don’t let used oil stay on your skin for very long. Clean
your skin and nails with soap and water, or a good hand
cleaner. Wash or properly throw away clothing or rags
containing used engine oil. See the manufacturer’s
warnings about the use and disposal of oil products.
Used oil can be a threat to the environment. If you
change your own oil, be sure to drain all the oil from
the filter before disposal. Never dispose of oil by putting
it in the trash, pouring it on the ground, into sewers, or
into streams or bodies of water. Instead, recycle it by
taking it to a place that collects used oil. If you have a
problem properly disposing of your used oil, ask your
dealer, a service station or a local recycling center
for help.
Engine Air Cleaner/Filter
Refer to the Maintenance Schedule to determine when to
replace the engine air cleaner/filter. See “Scheduled
Maintenance” in the Index.
The engine air cleaner/filter
is located in the center of
the engine compartment.
Your gasoline or diesel engine has a restriction indicator
that lets you know when the engine air cleaner/filter
needs to be serviced.