Beijing: Zhengtong BMW Museum 正通BMW博物馆 (CLOSED)

Open since 2015, address:

Beijing Baozhehang Dasha, No. 59 Xisanuan South Street (South Road West Third Ring), Fengtai District, Beijing Municipality

The Museum exhibits 33 cars. 30 BMW's, 1 Rolls Royce and 2 Mini's.

IT SEEMS THAT THE MUSEUM CLOSED 9 SEPTEMBER 2020. 

Most internet articles show the architectal aspects of the building. There is not so much about the cars.

https://www.dezeen.com/2016/08/28/beijing-bmw-museum-interior-design-crossboundaries-chinese-gates-red-fabric/
https://www.chinese-architects.com/nl/projects/view/bmw-museum-4

here is more about the cars:
http://m.pcauto.com.cn/x/911/9118951.html
游记之“宝马汽车博物馆” (qq.com)

This article proves that there are not only BMWs!
http://chat.gac.com/archive/201702/action07.html