1998 GMC Safari Owner's Manual - Page 362

Short TripKity Maintenance Fnhedule 100,000 Miles (166 000 km) 0 Inspect spark plug wires. DATE I MILEAGE An Emission Control Service. 0 Replace spark plugs. An Emission Control Service. 0 If you haven't used your vehicle under severe service conditions listed previously and, therefore, haven't changed your automatic transmission fluid, change both the fluid and filter. 0 Inspect Positive Crankcase Ventilation (PCV) valve. An Emission Control Service. 150,000 Miles (240 000 km) 0 Drain, flush and refill cooling system (or everymonths since last service, 60 DATE I MILEAGE whichever occurs first).See "Engine Coolant" inthe 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. 7-28