Chevrolet 2005 Astro Owner's Manual page 329

− When doing frequent trailer towing.
− Uses such as found in taxi, police or delivery
service.
If you do not use your vehicle under any of
these conditions, change the fluid and filter every
50,000 miles (83 000 km).
Replace fuel filter. An Emission Control Service.
(See footnote †.)
Rotate tires. See Tire Inspection and Rotation on
page 5-65 for proper rotation pattern and additional
information. (See footnote +.)
93,000 Miles (155 000 km)
Change engine oil and filter (or every 3 months,
whichever occurs first). An Emission Control Service.
Lubricate chassis components (or every 3 months,
whichever occurs first). (See footnote #.)
96,000 Miles (160 000 km)
Change engine oil and filter (or every 3 months,
whichever occurs first). An Emission Control Service.
Lubricate chassis components (or every 3 months,
whichever occurs first). (See footnote #.)
Rotate tires. See Tire Inspection and Rotation on
page 5-65 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.
Lubricate chassis components (or every 3 months,
whichever occurs first). (See footnote #.)
100,000 Miles (166 000 km)
Inspect spark plug wires. An Emission Control
Service.
Replace spark plugs. An Emission Control Service.
If you have not used your vehicle under severe
service conditions listed previously and, therefore,
have not changed your automatic transmission fluid,
change both the fluid and filter.
Change transfer case fluid.
Inspect Positive Crankcase Ventilation (PCV) valve.
An Emission Control Service.
150,000 Miles (240 000 km)
Drain, flush and refill cooling system (or every
60 months since last service, whichever occurs first).
See Engine Coolant on page 5-26 for what to use.
Inspect hoses. Clean radiator, condenser, pressure
cap and neck. Pressure test cooling system and
pressure cap. An Emission Control Service.
Inspect engine accessory drive belt. An Emission
Control Service.
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