Chevrolet Optra 2004 Owner's Manual page 298

18,000 Miles (30 000 km)
Change engine oil and filter (or every 3 months,
whichever occurs first). An Emission Control Service.
Rotate tires. See Tire Inspection and Rotation
on page 5-58 for proper rotation pattern and
additional information. (See footnote +.)
21,000 Miles (35 000 km)
Change engine oil and filter (or every 3 months,
whichever occurs first). An Emission Control Service.
24,000 Miles (40 000 km)
Change engine oil and filter (or every 3 months,
whichever occurs first). An Emission Control Service.
Rotate tires. See Tire Inspection and Rotation
on page 5-58 for proper rotation pattern and
additional information. (See footnote +)
27,000 Miles (45 000 km)
Change engine oil and filter (or every 3 months,
whichever occurs first). An Emission Control Service.
6-8
30,000 Miles (50 000 km)
Change engine oil and filter (or every 3 months,
whichever occurs first). An Emission Control Service.
Replace passenger compartment air filter. If you drive
regularly under dusty conditions, the filter may
require replacement more often.
Replace engine air cleaner filter. See Engine Air
Cleaner/Filter on page 5-18 for more information.
An Emission Control Service.
Rotate tires. See Tire Inspection and Rotation on
page 5-58 for proper rotation pattern and additional
information. (See footnote +.)
Replace spark plugs. An Emission Control Service.
Inspect drive belt(s).
Inspect timing belt.
Drain, flush and refill cooling system. See Engine
Coolant on page 5-21 for what to use. Inspect hoses.
Clean radiator, condenser, pressure cap and neck.
Pressure test the cooling system and pressure cap.
An Emission Control Service.
Inspect EVAP canister, vapor lines and solenoid valve
filter. An Emission Control Service. (See footnote †.)
Inspect PCV system. An Emission Control Service.
(See footnote †.)
Change brake/clutch fluid (or every 24 months,
whichever occurs first).