2004 Pontiac Grand Prix Owner's Manual - Page 395

90,000 Miles (150 000 km) u Replace engine air cleaner filter. See Engine Air Cleaner/Filter on page 5-22 for more information. An Emission Control Service. u For supercharged engines only: Check the supercharger oil level and add the proper supercharger oil as needed (or every 36 months, whichever occurs first). See Part D: Recommended Fluids and Lubricants on page 6-16. An Emission Control Service. (See footnote †.) u Rotate tires. See Tire Inspection and Rotation on page 5-71 for proper rotation pattern and additional information. (See footnote +.) u Replace passenger compartment air filter. If you drive regularly under dusty conditions, the filter may require replacement more often. u Change automatic transaxle fluid and filter if the vehicle is mainly driven under one or more of these conditions: − In heavy city traffic where the outside temperature regularly reaches 90°F (32°C) or higher. − In hilly or mountainous terrain. − When doing frequent trailer towing. − Uses such as found in taxi, police or delivery service. u If you haven't used your vehicle under severe service conditions listed previously and, therefore, haven't changed your automatic transaxle fluid, change both the fluid and filter. 150,000 Miles (240 000 km) u Drain, flush and refill cooling system (or every 60 months since last service, whichever occurs first). See Engine Coolant on page 5-26 for what to use. Inspect hoses. Clean radiator, condenser, pressure cap and neck. Pressure test the cooling system and pressure cap. An Emission Control Service. u Inspect engine accessory drive belt. An Emission Control Service. 97,500 Miles (162 500 km) u Rotate tires. See Tire Inspection and Rotation on page 5-71 for proper rotation pattern and additional information. (See footnote +.) 100,000 Miles (166 000 km) u Inspect spark plug wires. An Emission Control Service. u Replace spark plugs. An Emission Control Service. 6-9