Draining transmission oil

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2005 Porsche 911, 2004 Porsche 911, 2003 Porsche 911, 2002 Porsche 911, and 2001 Porsche 911. However, it is still accessible from the selected car via links, so may be relevant.

Remove underside panels.
Place oil collection pan under the transmission.
Unscrew oil filler screw -1-.

Fig 1: Locating Manual Transmission Oil Filler Screw And Drain Plug
Courtesy of PORSCHE OF NORTH AMERICA, INC.
Unscrew oil drainage screw and drain transmission oil.