1998 Chevrolet Express Van Owner's Manual - Page 316

Maintenance Schedule Short Trip/City Definition -- Gasoline Engines Follow the Short Trip/City Maintenance Schedule if any one of these conditions is true for your vehicle: Most trips are less than 5 to 10 miles (8 to 16 km). This is particularly important when outside temperatures are below freezing. Most trips include extensive idling (such as frequent driving in stop-and-go traffic). Most trips are through dusty areas. Short Trip/City Intervals -- Gasoline Engines Every 3,000 Miles (5 000 km): Engine Oil and Filter Change (or 3 months, whichever occurs first). Chassis Lubrication (or 3 months, whichever occurs first). Drive Axle Service (or3 months, whichever occurs first). Every 6,000 Miles (10 000 km): Tire Rotation. Every 15,000 Miles (25 000 km): Air Cleaner Filter Inspection, if driving in dusty conditions. Shields and Underhood Insulation Inspection (GVWR above 8,500 lbs. only). Front Wheel Bearing Repack (or at each brake relining, whichever occurs first). Every 30,000 Miles (50 000 km): Air Cleaner Filter Replacement. Fuel Filter Replacement. Every 50,000 Miles (83 000 km): Automatic Transmission Service (vehicles over 8600 GVWR or driven under severe conditions only). You frequently tow a trailer or use a carrier on top of your vehicle. If the vehicle is used for delivery service, police, taxi or other commercial application. One o the reasons you should follow this schedule if f you operate your vehicle under any of these conditions is that these conditions cause engine oil to break down sooner: 7-5