Dave enquired:
> I read somewhere that anti-freeze (which I stick in at 50-50) is
only good for a couple of years. Is this true? If it is then, given
that I have not changed the anti-freeze since the day I brought them,
why doesn't my car radiator, my boat radiators and my boat engine
cooling freeze in cold weather?
>
> Or am I living on borrowed time where these things are concerned?
You replace the anti-freeze on a regular basis to replace the corrosion
inhibitors that it contains, not the anti-freeze constituent itself.
People who do not renew anti-freeze run the risk of accelerated
corrosion to engine internals and head gaskets etc. So, in that sense,
you are living on borrowed time ;-)
Don't forget that a modern engine is a real mix of metals (aluminium
cylinder head, cast iron block etc etc) so the risk from electrolytic
corrosion is already enhanced, hence the need for corrosion inhibitors
in good condition.
Roger
