i have 2001 x5 4.4l

and my alternator went out,
so in the process of changing it,
when i took some water hoses out ,orange liquid come out,

but few months back i had to fill little bit and in the reservoir was green color so i have added more green antifreeze,

but last night,i was " like " what!,i was thinking i have color green antifreeze because that what a was in that reservoir reserve, and now is coming orange out!..offf..

so after installing all back ,i forgot to ask and i have put some orange one from autozone (1 gal) of the DEX-COOL prestone,now i need to add some more,but
i am confuse,if the orange is in the system right now,and then i think some my 10-20 % of that green stuff in it also,will this be okay?

i have some more of that dex-cool ,but now i dont know if this is for bmw?

this is what i have here

please advice what to do?


2.what will be the procedure to bleed the system..

thank you friends!!!

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2017 Bmw X5 F15