2001 GMC Savana Van Owner's Manual - Page 346

Scheduled Maintenance Long Trip/Highway Definition Follow this scheduled maintenance only if none of the conditions from the Short Trip/City Scheduled Maintenance are true. Do not use this schedule if the vehicle is used for trailer towing, driven in a dusty area or used off paved roads. Use the Short Trip/City schedule for these conditions. Driving a vehicle with a fully warmed engine under highway conditions causes engine oil to break down slower. Long Trip/Highway Intervals Every 7,500 Miles (12 500 km): Engine Oil and Filter Change (or every 12 months, whichever occurs first). Chassis Lubrication (or every 12 months, whichever occurs first). Drive Axle Service. Tire Rotation. Every 15,000 Miles (25 000 km): Gasoline Engine Only: Noise Shields Inspection (GVWR above 10,000 lbs. only). Diesel Engine Only: Shields and Underhood Insulation Inspection. Diesel Engine Only: Thermostatically Controlled Engine Cooling Fan Check (or every 12 months, whichever occurs first). Diesel Engine Only: Air Intake System Inspection. Every 30,000 Miles (50 000 km): Fuel Filter Replacement. Diesel Engine Only: Engine Air Cleaner Filter Replacement. Front Wheel Bearing Repack (or at each brake relining, whichever occurs first). 7-7