Chevrolet 2003 Astro Owner's Manual page 330

42,000
Miles (70 000 km)
CI Change engine oil and filter (or every 3 months,
whichever occurs first). An Emission Control Service.
U Lubricate chassis components (or every 3 months,
whichever occurs first). (See footnote #.)
c1 Check readfront axle fluid level and add fluid as
needed. Check constant velocity joints and axle seals
for leaking.
page 5-64 for proper rotation pattern and additional
information. (See footnote
+.)
0 Rotate tires. See Tire Inspection and Rotation on
45,000 Miles (75 000 km)
0 Change engine oil and filter (or every 3 months,
whichever occurs first). An Emission Control Service.
C l Lubricate chassis components (or every 3 months,
whichever occurs first). (See footnote #.)
Cl Check readfront axle fluid level and add fluid as
needed. Check constant velocity joints and axle seals
for leaking.
CI For Two-Wheel-Drive vehicles only: Clean and repack
the front wheel bearings (or at each brake relining,
whichever occurs first).
U Change automatic transmission fluid and filter
if the
vehicle is mainly driven under one or more of these
conditions:
-
In heavy city traffic where the outside
temperature regularly reaches 90°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.
U
Inspect engine air cleaner filter if you are driving
in dusty conditions. Replace filter if necessary.
An Emission Control Service. (See footnote
t.)
If you do not use your vehicle under any of these
conditions, change the fluid and filter every
50,000 miles (83 000 km).
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