Oldsmobile 1999 Intrigue - Manual (Page 260)

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5. Hold the air box cover and air duct assembly up in
position while removing the air filter element from
the air box.
To install the air filter, reverse the steps.
Be sure the tabs on the cover are inserted into the air
box slots.
Refer to the Maintenance Schedule to determine when to
replace the air filter and the crankcase ventilation filter.
See “Scheduled Maintenance Services” in the Index.