Mercury - Antifreeze (1 Gallon) Engine Freeze & Corrosion Protection 92-8M0050227. Overview. This is the kind of antifreeze you grab when fall starts creeping in and you know it's time to put the boat to bed for a bit. It pours clean, doesn't foam up, and moves through the system without any weird smells or residue. I've used it on engines that sat all winter in some pretty sharp cold, and everything woke up in spring without drama. It's basically one of those "don't overthink it" products that