2003 Buick Rendezvous Owner's Manual - Page 423

100,000 Miles (166 000 km) 0 Inspect spark plug wires. An Emission Control 150,000 Miles (240 000 km) 0 Drain, flush and refill cooling system (or every 60 months since last service, whichever occurs first). See Engine Coolant on page5-22 for what to use. Service. 0 Replace spark plugs. An Emission Control Service. 0 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. 0 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. Inspect hoses. Clean radiator, condenser, pressure cap and neck. Pressure test the cooling system and pressure cap. An Emission Control Service. Ll Inspect engine accessory drive belt. An Emission Control Service. 6-8