Chevrolet 1998 C/K Full-Size Pickup Owner's Manual page 397

I
Short TripKity Maintenance Schedule
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Gasoline Engines
1
- In hilly or mountainous terrain.
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When doing frequent trailer towing.
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Uses such as found in taxi, police or delivery service.
Manual transmission fluid doesn't require change.
previously and, therefore, haven't changed your automatic transmission fluid,
change both the fluid and filter.
Manual transmission fluid doesn't require change.
0
Inspect Positive Crankcase Ventilation (PCV) valve.
An Emission Control Service.
If you haven't used your vehicle under severe service conditions listed
150,000 Miles (240 000 km)
0
Drain, flush and refill cooling system (or every 60 months since last service,
whichever occurs first). See "Engine Coolant'' in the Index for what to use.
Inspect hoses. Clean radiator, condenser, pressure cap and neck. Pressure test
cooling system and pressure cap.
An Emission Control Service.
DATE
7-27