I used ATE Super Blue fluid on my last fluid change. It exceeds DOT 4 requirements, so the wet and dry boiling points should be plenty high for our purposes. I also like that you can get it in blue or amber color so you can see when you start bleeding the new fluid.
2015 740Li Black Sapphire Metallic. Her name is Samantha
2008 M3 Sedan Alpine White / Fox Red - Sold at 219K miles