2003 GMC Sonoma Owner's Manual - Page 372

Selecting the Right Schedule First you'll need to decide which of the two schedules is right for your vehicle. Here's how to decide which schedule ts follow: Short Trip/City Intervals Every 3,000 Miles (5 000 km): Engine Oil and Filter Change (or 3 months, whichever occurs first). Chassis Lubrication (or 3 months, whichever QCCUK first). Drive Axle Service. Every 6,000 Miles (IO 000 km): Tire Rotation. Every 15,000Miles (25 000 km): Engine Air Cleaner Filter Inspection, if driving in dusty conditions. Front Wheel Bearing Repack (two-wheel drive only) (or at each brake relining, whichever occurs first). Automatic Transmission Service (severe conditions only). Every 30,000 Miles (50 000 km): Engine Air Cleaner Filter Replacement. Fuel Filter Replacement (4.3L V6 engine only). Every 50,000 Miles (83 000 km): Automatic Transmission Service (normal conditions). Every 90,000 Miles (150000 km): Fuel Filter Replacement (2200 L4 engine only). Short Trip/City Definition Follow the Short Trip/City Scheduled Maintenance if any one of these conditions is true for your vehicle: Most trips are less than 5 miles (8 km). This is particularly important when outside temperatures are below freezing. 0 Most trips include extensive idling (such as frequent driving in stop-and-go traffic). You frequently tow a trailer. If the vehicle is used for delivery service, police, taxi or other commercial application. One of the reasons you should follow this schedule if you operate your vehicle under any of these conditions is that these conditions causeengine oil to break down sooner. 6-5