1997 GMC Safari Owner's Manual - Page 344

I Short TridCity Maintenance Schedule 60,000 Miles (100 000 km) (Continued) - In heavy city traffic where outside the 90 temperature regularly reaches F (32°C) or higher. - In hilly or mountainous terrain. - When doing frequent trailer towing. - Uses such asfound in taxi, police or delivery service. O I 0Replace air cleaner filter. An Emission ControlService. 0Inspect fuel tank, cap and lines for damage or leaks. Inspect fuel cap gasket for any damage. Replace partsas needed. An Emission Control Service. (See footnote?.) 0Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote+.) If you do not useyour vehicle under any o these f conditions, change the fluid and filter every 30,000 miles (50 000 km). 0Inspect engine accessory drive belt. 0Replace fuel filter. An Emission Control Service. (See footnoteJf.) 7-20