Buick 2004 Park Avenue Owner's Manual page 370

45,000 Miles (75 000 km)
Change engine oil and filter (or every 12 months,
whichever occurs first). An Emission Control
Service. (See footnote *.)
Inspect engine air cleaner filter. See Engine Air
Cleaner/Filter on page 5-20 for more information.
An Emission Control Service. (See footnote †.)
Replace passenger compartment air filter.
Rotate tires. See Tire Inspection and Rotation on
page 5-72 for proper rotation pattern and additional
information. (See footnote .) (See footnote +.)
50,000 Miles (83 000 km)
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.
If you do not use your vehicle under any of these
conditions, change the fluid and filter at 100,000 miles
(166 000 km).
6-16
52,500 Miles (87 500 km)
Change engine oil and filter (or every 12 months,
whichever occurs first). An Emission Control
Service. (See footnote *.)
Rotate tires. See Tire Inspection and Rotation on
page 5-72 for proper rotation pattern and additional
information. (See footnote .) (See footnote +.)
60,000 Miles (100 000 km)
Change engine oil and filter (or every 12 months,
whichever occurs first). An Emission Control
Service. (See footnote *.)
Replace passenger compartment air filter.
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 6-25. An Emission
Control Service. (See footnote †.)
Rotate tires. See Tire Inspection and Rotation on
page 5-72 for proper rotation pattern and additional
information. (See footnote .) (See footnote +.)
Replace engine air cleaner filter. See Engine Air
Cleaner/Filter on page 5-20 for more information.
An Emission Control Service.