17 11 040 Removing and installing/replacing thermostat cartridge for transmission oil cooling E53 / M62: Installation:

WARNING: This page is about a different car, the 2003 BMW X5, 2002 BMW X5, 2001 BMW X5, and 2000 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.

Check O-rings, replace if necessary.

Fig 1: Removing Thermostat For Transmission Oil Cooling

Courtesy of BMW OF NORTH AMERICA, INC.