1995 GMC Yukon Owner's Manual - Page 374

Every 30,000 Miles (50 000 km) Cooling System Service (or every 24 months, whichever occurs first) Spark Plug Replacement Fuel Filter Replacement Air Cleaner Filter Replacement Front Wheel Bearing Repack Every 50,000 Miles (83 000 km) Automatic Transmission Service (severe conditions only) Every 60,000 Miles (100 000 km) Spark Plug Wire Inspection Engine Accessory Drive Belt Inspection Fuel Tank, Cap and Lines Inspection Engine Timing Check I Definition - Gasoline Engines With Heavy Duty Emissions Follow Maintenance Schedule 1 if any one of these is true for your vehicle: 0 Most trips are less than 5 to 10 miles (8 to 16 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 operate your vehicle in dusty areas or off-road frequently. You frequently tow a trailer or use a carrier on top of your vehicle. 0 Schedule I should also be followed if the vehicle is used for delivery service, police, taxi, or other commercial application. Schedule I Intervals - Gasoline Engines with Heavy Duty Emissions Every 3,000 Miles ( 000 km) 5 Engine Oil and Filter Change (or every 3 months, whichever occurs first) Chassis Lubrication (or every 3 months. whichever occurs first) Drive Axle Service