Is the earth flat.   Looks flat to me.   Is water
corrosive.   Where you see rust you see water.   Must
be the water like the earth is flat.
   Oxygen is corrosive not water.    Rust is iron
oxide and we have aluminum oxide too.
   Someone said the orange stuff gels and the green
stuff is corrosive like water.
   I think more effort should be placed on what will
keep the engine cool and the waterpump lubricated.
   I was impressed that the orange stuff was used in
other german cars.   After flushing my system I added
the orange stuff.   It will gel but only if there is
still some green stuff around or if you use if over
50%.    It is very organic and less ionic than the
green stuff.   In the summer I think 30% would work
just fine.
   Hot coolant will disolve less oxygen than cold
coolant and a sealed system should be mostly free of
oxygen.
Keep your system topped off with whatever you choose
to use and remeber that water is your friend.
   A 0.2M citrus acid enemia is a good idea if you are
running a bit hot.   Isolate the radiator at the big
pipes and flush with hot water.   Soak the radiator
for a week with the enemia and flus with hot water.
    Keep cool this summer.   If you are running hot
fix it and fix it now.
   and for the record water is not corrosive, gary
From:    David Brodbeck <gull@GULL.US>
Subject: Re: Cooling strategies, color coded, etc.

On Thu, 29 Apr 2004, Daniel L. Katz wrote:

> maybe we can get a chemist to comment; but, it seems
logical that
> distilled water would actually be more corrosive
than average tap
water.
> there may be some advantage in terms of reducing
mineral deposits,
but
> distilled water should really be more corrosive
because it is farther
from
> chemical equilibrium with respect to cooling system
materials.

In fact, tap water's pH is usually adjusted at the
treatment plant to
make
sure it isn't corrosive to the water mains.  (This
isn't true if you
have
your own well, of course.)

The concern with tap water is that the minerals in it
could react with
chemicals in the coolant and cause them to settle out,
forming deposits
that can clog the system.  This is supposedly why VW
specified
phosphate-free coolant.

David Brodbeck, N8SRE
'86 Volvo 240DL wagon

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