Looks like I had green coolant in there but my local auto store only had:
Prestone® MAX European Vehicles (Blue) Antifreeze + Coolant
Am I screwed? Should I drain it ASAP?
Edit: the large tank was basically empty so I doubt any mixed yet but there was still some in the smaller tank
Huh, you learn something new everyday. I had no idea BMW switched to green coolant.
Anyways, I found this on Tischer’s product page for the green stuff. If you can make out the German symbology, have at it. It looks like if you got “G48” and mixed it with the “HT12”, that’s ok. No clue if G48 is like a standard (e.g. LL01 for oil), or if it’s a BMW-specific term/number.