1993 Buick Roadmaster Owner's Manual - Page 309

To help ensure-properoperation, we recommena a pressure testof both'thecooling system and the pressure cap. of If you do not use your vehicle under anythese conditions, change both the fluid and every filter 100,000 miles (1 60 km). 000 Wheel Bearing Repack -When your 9. Spark Replacement* -Replacesparkplugs Plug 7. Front vehicleisusedinsuchservice as policework, as awiththepropertype.See"SpecificationsChart.'' in delivery, and clean repackthe the Index. taxi in door-to-door or Spark plug Wire Inspection*? -Inspect for front wheel bearings at each brake relining or 15,000 miles (25 000 km), whichever comes first.If you burns, cracks .or other damage. Check the bootat fit don't use your vehicle such service, clean in and the distributor and at the spark plugs. Replace wires repackthebearings at eachbrakereliningor 30,000 as. needed. miles (50 000 k ) m whichever comes first. 11.Exhaust Gas Recirculation (EGR) System 8. Transmission Service Change both the fluid and Inspection*? -Conduct theEGR system service filter every15,000miles (25 000 km) if the vehicle To as described in the service manual. purchase a is mainly driven under one or 'morethese of service manual, see "Service Publications" in the conditions: Index. In heayy city traffic where the outside 12. Air Cleaner Filter Replacement* Replace every temperature regularly reaches'90O F (32 C) or 30,000 miles (50 000 k ) moreofkn under dusty m or higher. conditions. Ask your dealer for the proper replacement intervals for your driving conditions. In hilly or mountainous terrain. When doing frequent trailer towing. Uses such as found in taxi, police car delivery or service. - 307