Necessary preliminary tasks

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2013 BMW 128i, 2012 BMW 128i, 2011 BMW 128i, 2010 BMW 128i, and 2009 BMW 128i. However, it is still accessible from the selected car via links, so may be relevant.

Remove ACOUSTIC COVER
Protect drive belt against dirt
Have a cleaning cloth ready to catch escaping oil

Disconnect plug connection on oil pressure switch (3)

Remove oil pressure switch (3).

Fig 1: Disconnecting Plug Connection Of Oil Pressure Switch

Courtesy of BMW OF NORTH AMERICA, INC.

Screw in special tool 11 4 050 with sealing ring.

Fig 2: Identifying Sealing Ring And Special Tool (11 4 050)

Courtesy of BMW OF NORTH AMERICA, INC.