Saturn 2004 Ion - Manual (Page 252)

Engine Air Cleaner/Filter
Engine Air Cleaner/Filter Replacement
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).
2.2L L4 Engine
2.0L Supercharged Engine
5-22