Antifreeze PEAK or Pentosin

Yes most certainly I always use Pentofrost/Pentosin VW-Specific Concentrated Coolants. Always have for every VW I have ever owned.

I ran the euro Peak without issue for about a year but I was bleeding coolant and in desperate need of the cooling system overhaul.

My car is currently filled with the Peak Euro Blue stuff, works fine, identical to the OE BMW formula anyway

Yes, that will work. I did Pentofrost G13 equivalent for my top-up coolant.

I personally use Peak brand coolant, and I've never had an issue for 100K+ miles.

Even though most will say to stick with G12/G13, I think that is where that "sand" comes from. I decided last year to completely drain the system - including engine block - and converted to Peak antifreeze. I have not had any problems since.

It is best to use the genuine BMW coolant, but in an emergency Pentosin NF antifreeze is apparently compatible with the OE coolant in your BMW.

Ditto. I only use G11, made by Pentosin.

I believe Pentosin Pentofrost A3 is equivalent and it's also $19 from Advance Auto. I have both at home because the Pentosin is equivalent to Subaru coolant as well.

I'm almost positive that VW uses Pentosin at the factory- I think the G12/G13 is the same stuff as the Pentofrost SF/Pentofrost E.