1993 Buick Riviera Owner's Manual - Page 281

conditioning condenser.Wash the pressure cap and neck. To help ensure proper operation, recommend a we pressure testof both the,cooling system and the pressure cap. 7. Transaxle Service -- Change both the fluid and filter every 15,000 miles (25 000 km) if the vehicle is mainly driven under one or more these conditions: of In heavy city traffic where the outside temperature regularly reaches 90 F (32 C) or higher. In hilly or mountainous terrain. Uses such as found in taxi, police car or delivery service. If you do not use your vehicle under any of these conditions, change both fluid andfilter every the 100,000 miles (160 000 km). 8. Spark Plug Replacement* -- Replace spark plugs with the proper type. See "Specifications Chart" in the Index. * 9. Spark Plug Wire Inspection*? -- Inspect for burns, cracks or other damage. Check the boot at the fit distributor and at the spark plugs. Replace wires as needed. 10. Air Cleaner Filter Replacement* -- Replace every 30,000 miles(50 000 km) or more often under dusty conditions. Ask your dealer for the proper replacement intervals for your driving conditions. 11. Fuel Tank, Caa,and Lines Insa,ection*T -- Inspect fuel tank, cap and lines (including fuel rails and injection assembly,if equipped) for damage or leaks. Inspect fuel cap gasket for an even filler neck imprint or any damage. Replace parts needed. as Periodic replacement of the fuel filter not required. is 3 The U.S.Environmental ' 1 An Emission Control Service. Protection Agency has determined that the failure to perform thismaintenance item will not nullify the emission warranty or limitrecallliability prior to the completion vehicle of be be recorded in "Section EMaintenance Record". useful life.General Motors, however,urges that all recommended maintenance services performed at the indicated intervals and the maintenance 1: 279