Chevrolet 2008 Optra Owner's Manual page 311

Replace spark plugs. An Emission Control Service.
Replace fuel filter. An Emission Control Service.
(See footnote †.)
Check restraint system. Make sure the safety belt
reminder light and safety belt assemblies are
working properly. Look for any other loose or
damaged safety belt system parts. If you see
anything that might keep a safety belt system from
doing its job, have it repaired. Have any torn or frayed
safety belts replaced. Also see Checking the
Restraint Systems on page 1-66.
Inspect drive belt(s).
Inspect EVAP canister, vapor lines, and EVAP
vent solenoid valve. An Emission Control Service.
(See footnote †.)
Inspect PCV system. An Emission Control Service.
(See footnote †.)
93,000 Miles (155 000 km)
Change engine oil and filter (or every 3 months,
whichever occurs first). An Emission Control Service.
96,000 Miles (160 000 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 5-60 for proper rotation pattern and
additional information. (See footnote +.)
99,000 Miles (165 000 km)
Change engine oil and filter (or every 3 months,
whichever occurs first). An Emission Control Service.
150,000 Miles (240 000 km)
Drain, flush, and refill cooling system. This service
can be complex; you should have your dealer/retailer
perform this service. See Engine Coolant on
page 5-19 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.
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