You think way to much about this.
Clear your head , go grab a gallon of Prestone and a gallon or water (dont matter distilled or tap) and change your coolant.
Dont think to much about such simple things.
PS, the car will never run hot or boil over if your cooling system works properly. Dont matter what coolants in it and what color it is.
Original BMW Teile ///
Original BMW Parts for Sale - DISA, MAF, SAP, Coils, MS43 much more PM ME