Antifreeze PEAK or Pentosin

Not an LS specifically but I had good luck with the PEAK 50/50 pre-diluted mix from Autozone.

I used peak when I changed my rad, no issues so far

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

I use Peak for Asian vehicles, green in color, for my Mazda's. Get it at most auto parts stores in 50/50 mix so you never worry about cold temps in winter.

Use pentosin

Peak final charge is compatible and meets all necessary specs. Bonus is it's available almost everywhere in the US and Canada

I use peak 50/50 blue European with no issues

I used the Peak coolant that was pink, it's been a few weeks and no catastrophe so I think you are fine.

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.