In article , krw wrote:

Is -134F protection really needed?? ;-) In any case, even if anti-
freeze freezes it won't crack a block like water will. Water is
the only material that expands when it freezes.

Might be the only one you know of... but it's not the only one.

Anti-freeze
shrinks so it won't bust a block, as long as you don't try running
the engine with it frozen (solid antifreeze doesn't cool well.

Whether ethylene glycol expands or contracts when it freezes is immaterial,
since nobody uses it pure as an engine coolant -- and the 50-50 aqueous
solution of E.G. that *is* typically used as coolant certainly *does* expand
when it freezes.

--
Regards,
Doug Miller (alphageek at milmac dot com)

It's time to throw all their damned tea in the harbor again.