Buick 2003 Century Owner's Manual page 319

When the system has calculated that oil life has been
diminished,
it
will indicate that an oil change is
necessary. A CHANGE ENGINE OIL SOON light will
come on. Change your oil as soon as possible within the
next two times you stop for fuel. It is possible that,
if you are driving under the best conditions, the oil life
system may not indicate that an oil change is necessary
for over a year. However, your engine oil and filter
must be changed at least once a year and at this time
the system must be reset. It is also important to
check your oil regularly and keep it at the proper level.
If the system is ever reset accidentally, you must
change your oil at 3,000 miles (5 000 km) since your
last oil change. Remember to reset the oil life system
whenever the oil is changed. See Engine Oil on
page 5-13 for information on resetting the system.
After the services are performed, record the date,
odometer reading and who performed the service on the
maintenance record pages in Part E of this schedule.
An Emission Control Service.
7,500
Miles (12 500 km)
L l Rotate tires. See Tire lnspection and Rotation on
page 5-60 for proper rotation pattern and additional
information. (See footnote @.) (See footnote +.)
15,000 Miles (25 000 km)
0
Inspect engine air cleaner filter if you are driving in
dusty conditions. Replace filter if necessary. An
Emission Control Service. (See footnote f.)
0 Replace passenger compartment air filter. If you
drive regularly under dusty conditions, the filter
may require replacement more often.
0
Rotate tires. See Tire lnspection and Rotation on
page 5-60 for proper rotation pattern and additional
information. (See footnote @.) (See footnote +.)
22,500 Miles
(37 500
km)
0 Rotate tires. See Tire lnspection and Rotation on
page 5-60 for proper rotation pattern and additional
information. (See footnote
62.)
(See footnote
+.)
30,000 Miles (50 000 km)
0 Replace passenger compartment air filter. If you
drive regularly under dusty conditions, the filter
may require replacement more often.
0 Rotate tires. See Tire lnspection and Rotation on
page 5-60 for proper rotation pattern and additional
information. (See footnote @.) (See footnote +.)
D Replace engine air cleaner filter. An Emission Control
Service.
6-6