If you can't find the BMW coolant what you need is a G-48 coolant. G48® – Hybrid coolant containing silicate ǀ Glysantin®.
This is the OEM manufacture. If you google G-48 you will find a few other, typically repackaged.

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2003 X5 4.6is Estoril Blue
2005 Infiniti G35X
1972 Datsun 240Z
1991 Isuzu Impulse XS Sold
1972 Fiat 850 Spyder Donated
1972 Datsun 240Z Sold
1972 Datsun 510 Sold