Chevrolet 1997 Astro Owner's Manual page 361

-
In heavy city traffic where the outside
temperature regularly reaches 90
O F
(32°C) or higher.
-
In hilly or mountainous terrain.
- When doing frequent trailer towing.
-
Uses such as found in taxi, police or
delivery service.
I f
you do not use your vehicle under any o f these
conditions, change the fluid and filter every
30,000 m i l e s (50 000 km).
0
Rotate tires. See "Tire Inspection and
Rotation" in the Index for proper rotation
pattern and additional information.
(See footnote
+.)
0
Inspect engine accessory drive belt.
Replace fuel filter.
An Emission Control Service.
0
Replace air cleaner filter.
13
Inspect fuel tank, cap and lines for damage
or leaks. Inspect fuel cap gasket for any
damage. Replace parts as needed.
An Emission Control Service.
(See footnote?.)
(See footnote?.)
An Emission Control Service.
7-37