[Keith True]

It seems like people are under the impression that when the temp drops to whatever the protection is mixed to the coolant will turn into a solid block.That doesn't happen.It will slush.I worked for a contractor that took everything down to about zero to plus 5.He got into that habit during the mid 70's when antifreeze skyrocketed.It saved him a couple of drums a year back then,and he just stuck with it.I've worked around farm equipment,heavy equipment,and trucks all my life.I've never once seen anything freeze solid unless it had pure water in it.Well,once a few years ago I did see low-tox antifreeze freeze solid,we won't trust that stuff beyond one winter anymore.