Chevrolet 2003 Corvette Owner's Manual page 331

50,000 Miles (83 000 km)
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.
- Uses such as high performance operation.
If you do not use your vehicle under any of these
conditions, change the fluid and filter at
100,000 miles (166 000 km). Manual
transmission fluid doesn't require change.
60,000 Miles (100 000 km)
Replace engine air cleaner filter. An Emission
Control Service.
75,000 Miles (125 000 km)
Inspect engine air cleaner filter if you are driving in
dusty conditions. Replace filter if necessary. An
Emission Control Service. (See footnote f.)
90,000 Miles (150 000 km)
*
Replace engine air cleaner filter. An Emission
Control Service.
100,000 Miles (166 000 km)
*
Replace spark plugs. An Emission Control Service.
Inspect spark plug wires. An Emission Control
Service.
*
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.
-
Uses such as high performance operation.
If you haven't used your vehicle under severe
conditions listed previously and, therefore, haven't
changed your automatic transmission fluid,
change both the fluid and filter. Manual transmission
fluid doesn't required change.
150,000 Miles (240 000 km)
Drain, flush and refill the cooling system (or every
60 months since last service, whichever occurs
first). See Engine Coolant on page 5-23 for what to
use. An Emission Control Service.
*
Inspect engine accessory drive belt. An Emission
Control Service.
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