1998 Chevrolet Astro Owner's Manual - Page 340
1998 Chevrolet Astro Manual
Page 340 highlights
Maintenance Schedule IShort Trip/City Intervals Every 100,000 Miles (166 km): Spark Plug Wire 000 Inspection. Spark Plug Replacement. Positive Crankcase Ventilation (PCV) Valve Inspection. Every 150,000 Miles (240 000km): Cooling System Service (or every 60 months, whichever occurs first). These intervals only summarize maintenance services. Be sure to followthe complete maintenance schedule on the following pages. Long Trip/Highway Definition , - Follow this maintenanceschedule only if none of the conditions from the Short TripKity Maintenance Schedule is true. Do not use this schedule if the vehicle is used for trailer towing, driven ina dusty area or used off paved roads. Use theShort Trip/City schedule for these conditions. Driving a vehicle with a fully warmed engine under higlzway conditions causes engine oil to break down slowec c 7-6