WARNING: This page is about a different car, the 2009 Audi A4, 2008 Audi A4, 2007 Audi A4, 2006 Audi A4, and 2005 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Oil Spray Jet For Piston Cooling
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Insert bolt (9 Nm) using locking compound; locking compound
Oil spray jet with spray nozzle valve (opening pressure 2 to 2.4 bar positive pressure)