1994 GMC Safari Owner's Manual - Page 301

Explanation Of Scheduled Maintenance Services Below are explanations of the services listed in the maintenance charts. The proper fluids and lubricants to use are listed in this section. Make sure whoever services your vehicle uses these. All parts should be replaced and all necessary repairs done before you or anyone else drives the vehicle. 1. ENGINE OIL AND OIL FILTER CHANGE* ALWAYS USE API SERVICE SH OR SG ENERGY CONSERVING I1 OILS OF THE PROPER VISCOSITY. The "SH" or "SG' designation may be shown alone or in combination with others, such as "SH/CD", or "SH, SG, CD," or "SG/CD", etc. To determine the preferred viscosity oil for your vehicle's engine see"Engine Oil" in the Index. 2. CHASSIS LUBRICATION-Lubricate the front suspension, steering linkage, transfer case shift linkage, parking brake cable guides, and brake pedal springs at the intervals specified on the proper maintenance schedule, or at every engine oil change, whichever comes first. Ball joints and king pin bushings should not be lubricated unless their cold, let temperature is 10°F (-12°C) or higher. When the weather is them warm up before lubricating them or they could be damaged. Also, be sure to check all the vehiclefluid levels at this time. 3. COOLING SYSTEM SERVICE* Drain, flush and refill the system with new or approved recycled coolant conforming to "GM Specification 6038-M". See "Engine Coolant" in the Index for the proper coolant and mixture to use in your vehicle. Also inspect the hoses and replace them if they are cracked, swollen, or deteriorated. Clean the outside of the radiator and air conditioning condenser. Wash the radiator neck. To ensure proper operation, pressure test the radiator and cap. 4. AIR CLEANER FILTER REPLACEMENT* Replace at - specified intervals. Ask your dealer for the proper replacement intervals for your driving conditions. 5. FRONT WHEEL BEARING REPACK (2-WHEEL DRIVE ONLY)- Clean and repack thefront wheel bearings at each brake relining, or at the specified interval, whichever comes first. * An Emission Control Service 7-7