1996 Chevrolet Express Van Owner's Manual - Page 304

Maintenance Schedule I Short Trip/City Definition -- Gasoline Engines I Follow the Short TripKity 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 1 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 (or 3 months, whichever occurs first). At 6,000 Miles (10 000 km) Then Every 12,000 Miles (20 000 km): Tire Rotation. -- You frequently tow a trailer or use a carrier on top of your vehicle. You frequently tow a trailer or use a carrier on top of your vehicle. (With some models, you should never tow a trailer. See "Towing a Trailer" in the Index.) If the vehicle is used for delivery service, police, taxi or other commercial application. 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 Ibs. only). Thermostatically Controlled Engine Cooling Fan Check (or every 12 months, whichever occurs first). 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 conditionsonly). One o the reasons you should follow this schedule (f f you operate your vehicle under anyof these conditions is that these conditions cuuse engine oil to break down soonex