A few Mild Hybrid links. I never even knew what this was about, but it will be on my upcoming X6 xDrive build tomorrow.
https://www.bmwblog.com/2020/05/06/h...id-technology/
https://www.bmwblog.com/2020/05/27/48v-bmw-51-models/
xDrive 40i has it and M50i does not, but both have auto stop/start