This might not be the answer you are looking for.  But on the Mercedes list
that I am on, this was discussed extensively.  The conclusion was this:  Do
NOT use deionized water.  As a matter of fact, MB specifically says to not
use distilled water.  Unfortunately, I am not the chemist type, so I can't
give you all the details behind this.  From what I remember, those ions are
an important part of the cooling process.
Water Wetter is great, btw, I run it in all my cars.  I live in Arizona, so
I run a 30% MB coolant, 1 bottle of WW and rest is tap water mix.

Cheers,
Greg
1977 240D 274kMi
???? Vanagon (Reading and learning and looking) =)

-----Original Message-----
From: Antaki [mailto:wrack@home.com]
Sent: Thursday, July 27, 2000 11:31 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: [cooling] Water Wetter concoction, de-ionized water

No chemist I, but I wonder, would de-ionized water seek to replenish it's
lost ions by leaching from the engine and cooling system components??

Anyone?
(For Vanagon list members, this was posted in the Scirocco list, but I know
there are a lot of smart poeple here who can provide insight. I will post
answers there.)

>       I have some Water Wetter on the way and am wondering what the best
> mix of coolant would be for me to put in. For summer, should I run WW and
> mostly water with a little coolant? I can get some super clean de-ionized
> water from the chem lab. Is it a good idea to use de-ionized water? I'm
> interested to hear what people have found to work best for summer/winter..
>
> tia,
>
> ___Wojciech Galecki___
> '84 8v Scirocco

 R    ���
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Antaki

 Proofread carefully to see if you any words out.