Ok, for those of us (probably only me up here) who use the crossfire as daily driver and cannot store it in a nice cosey garage... I am worried about the antifreeze freezing and breaking the block.

I tested the stock coolant with a hydrometer and it said my coolant was only good to -20° to -25°...

It is currently -16° and last night reached -17° and I know it could get colder just by looking a town a little north of me. So, I feel I should forget about changing the coolant at 100k and get the coolant that can stand as much as -40°. Anyone know which coolant can do this if the stock coolant cannot handle these temperatures? The car is pretty much my life and I would be screwed if old man Winter blows too hard and breaks my block! And no do not say go back to Florida because I am stuck here for about 4 months... lol