Antifreeze Pentosin or OEM BMW

I've used pentosin E for full flushes of two Golfs (2015 and 2017). No issues. Prior to that, I used it for topping off. It's the right stuf being G13 regardless of slight color variation pink/purple.

BMW coolant is down right awesome stuff.

I’ve used Pentosin Pentofrost NF, it’s the same as OEM

Use pentosin

I've always used the Pentosin equivalent in all my Volkswagens and Audis. Pentosin E/SF. Pentosin SF is G12 (pink) -2005, Pentosin E is G13 (violet) 2006 onwards. Safe to mix with factory fill, of course can always go to the dealer for coolant too. These are concentrate, so you do have to mix 50/50 with distilled water though

If it's inconvenient to go to the dealer, you can buy the correct coolant at NAPA, they carry Pentosin brand chemicals.

genuine BLUE BMW coolant (they released a GREEN BMW coolant around 2019 so remember to specify you want BLUE when ordering parts now). I dilute it 50/50 with distilled water (not tap water).

BMW blue only.

I had a bunch of Audi G11 kicking around from my Audi 100 that I used to have. Made by Pentosin, same smurf piss BMW used.

Put it in my e90 when I did the water pump.

So you don't mix coolants. BMW coolant uses embedded teflon or something. Dump in the wrong coolant and you have to run (I kid you not) laundry detergent through the entire system several times, flush the shit out of it several times then replace every single rubber hose.