Buick 2005 Century - Manual (Page 228)

Engine Air Cleaner/Filter
See Engine Compartment Overview on page 5-12
for the location of the engine air cleaner/filter.
When to Inspect the Engine
Air Cleaner/Filter
Inspect the air cleaner/filter at every oil change and
replace at the first oil change after 25,000 miles
(40 000 km).
How to Inspect the Engine Air
Cleaner/Filter
To inspect the air cleaner/filter remove the filter from
the vehicle and lightly shake the filter to release
loose dust and dirt. If the filter remains caked with dirt,
a new filter is required.
To inspect or replace the engine air cleaner/filter,
do the following:
1. Loosen the screw and clamp on the air duct.
2. Lift the two clips
located on the top of
the filter assembly
to unlock the cover.
3. Disconnect the duct and reposition it while removing
the cover.
4. Inspect or replace the engine air cleaner/filter.
5. Reinstall the air duct and cover by reversing
Steps 1 to 3.
5-18