I will bet 95% of the people use the cheap pink RV stuff from Walmart. Yet I believe it says not for engines. There is also pink stuff a little more expensive that is alcohol free but it also says not for engines.
West Marine sells antifreeze for engines that is a little more expensive than the cheap pink stuff. (still it's winterizing antifreeze, not coolant).
Fresh water system in boats and RV has copper, brass, bronze, rubber and plastic probably no iron or aluminum like an engine would have. So maybe it's the low level of corrosion inhibitors for steel and aluminum?
West Marine sells antifreeze for engines that is a little more expensive than the cheap pink stuff. (still it's winterizing antifreeze, not coolant).
Fresh water system in boats and RV has copper, brass, bronze, rubber and plastic probably no iron or aluminum like an engine would have. So maybe it's the low level of corrosion inhibitors for steel and aluminum?