WARNING: This page is about a different car, the 2002 Pontiac Sunfire and 2002 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
Remove the oil level indicator.
Remove the oil fill tube nut.
Remove the oil fill tube.
Fig 1: Oil Fill Tube
Courtesy of GENERAL MOTORS CORP.
Remove the oil fill tube seal from the engine block.