-50 or -100 antifreeze

[simple]

Assuming the boat is left in SE Wisconsin outside, and the majority of the water is drained from the block, which type would you go with?

[stevieray]

Protect for the lowest temp you expect it to see - I assume you've been living in that area for a while? If not, check with an old geezer who has seen it all. And always prepare for the worst case - nature sides with the hidden flaw (Murphy's Law, Corrollary #72).

OR you can check out this thread. If you're not confused now, you will be.

http://forums.iboats.com/bbBoard.cgi...4;gtid=1178457

[Silvertip]

Protecting to -40F is sufficient in southern Wisconsin. Northern Wisconsin as well.

[Silver/Fish]

Silvertip, If we get to the point where -40F is not sufficient....I'm moving!!!

[John_S]

I use the -100 even though -30 is about as cold as it ever gets. I reuse the anti-freeze each year, and the -100 will handle the small amount of residual water that it gets on each use, longer.

[Silvertip]

Shucks -- if you move south you go from your air conditioned house, to your air conditioned car to the air conditioned shopping mall or to the sweltering heat and humidity of a non-air conditioned boat. Up here in the tundra we go from our heated house to our heated car to our heated shopping mall or to our heated ice fishing shelter. If its really nasty outside we stay in and eat the venison that we shot last fall. In summer we fish. It doesn't get any better than that. Oh yes -- some folks still have to work but I'm retired so I get to fish anytime, anywhere.