Antifreeze instead of water?

In your car, it’s a closed system. No oxygen, no burn. Not so sure in the GF. It’s pretty flammable stuff

Um no, it is not a closed system, it’s a mostly closed system. in fact there is a tank which allows the expansion/contraction, which eventually gets rid of the air that happens when you open the cap and air gets in… Once the engine has run after a coolant change/cap opening and it heats/contract then air is out of it, but some air does get into the system. I am assuming the GF has a completely closed system (I can’t imagine taking our GF to juffy-lube for a coolant change…)