Personally I use water and a traditional Blue/Green antifreeze on a 50:50 mix.
I'm sure I read that there may be an issue with OAT technology and some classic silicon/copper parts which steered me away from using it.
Yep, me too. AIUI the only real advantage of OAT is a longer service life, but with our pampered darlings the idea of skimping on servicing is anathema.
