Never had any trouble with green, even after years of neglect. Kept in proper mix ( near 50-50 ) it does fine.

Recently picked up some antifreeze, and was surprised to see it was yellow. ( orange ? ) The instructions said it mixes fine, so mixed it got. No trouble so far.

For my truck, I tried some of that supercool stuff, it wasn't the ethelyene glycol, maybe propelne? It was guaranteed to make it run ten deg cooler, but I dunno if it did. You see the belt jumped off the pulleys and tangled into the fan blade, and as result the fan ate the radiator. Brand new radiator too. dammit.