AP03 ATC450 Transfer Box Case Assembly 27107605344 for X3 F25 X5 E70 X6 E71 E72 Fill one liter of transfer case oil before installation using ZF6 speed oil.After installation, do not test run the vehicle.Use diagnostic to perform the matching procedure without changing the motor or selecting alternative options.Start the quick test, navigate to axle processing, then service function, drive device, transfer case, and maintenance.Select the second option: Replace the transfer case control unit.Input the level as prompted by the system, enter the last digit of the transfer case MPT number (MPTxxxxxx), confirm the level, and begin motor debugging.Wait for 30 seconds until the system confirms successful calibration, then proceed with a test run.If any issues occur, repeat the entire process. OEM numbers: 27107643751, 27107605344, 27107609196, 27107610586, 27107619178, 27107627944, 27107629405, 27107635753, 27107636480, 27107639271, 27107635754, 27107605345, 27107643752, 27107643753, 27107697972, 27107697973, 27107697974 Fits the following models: X3 F25, X5 E70, X6 E71, X6 E72 X5 2009–2013 xDrive35i (E70) X6 2009–2014 xDrive35i (E71) Disclaimer: This is not an part.References to brands or models are used only to illustrate compatibility.