2025-08-20 00:00:00 The BMW Add-On Mobility App operated by SIXT extends the functions of the My BMW App with a customized rental and service offer via our cooperation partner. Book more range, more comfort, more space - or simply more driving pleasure. Select and open your rental car directly via app or benefit from the free fueling service upon return. In addition, get access to the SIXT Diamond Lounge, benefit from discounted additional packages and other advantages*. The benefits at a glance*