William:  I have had a similar experience.  I had the green
anti-freeze in and then I thought that I'd better use the
"good" VW (expensive) orange stuff - when I did I got
leaks from nearly every hose clamp and also ever-so-
slight weeping  from the head gaskets.  My (trusted)
mechanic says that it has something to do with molecule
size and he suggested that I go back to the green stuff.
Go figure.  Malcolm

On 28 Sep 2001, at 8:22, Greenamyer, William L wrote:

> Had a very interesting experiment (totally unplanned).  I
> have some external cracks in the external part of the water
> jacket on my boxer.  I had green antifreeze initially.
> Added some stop leak.  The leak stopped.  Later on, I
> changed to the green antifreeze (phosphate free).  Within a
> short time, the leak started up again.  Had to take the van
> in to the mechanic for some work and he noticed that the
> coolent was down so he filled it up with the green stuff.
> When I got the van back, I expected to be putting coolent in
> it again.  No such luck.  It stopped leaking again???  Later
> on, as the coolent was used, I started adding in the orange
> again.  All of a sudden, the leak was back.  Kept putting
> the orange antifreeze in until I ran out.  Couldn't find a
> source for a while so started using the green in the mean
> time. Suprise.  The leak has almost stopped again.  Normally
> I wouldn't think much of this but the boxer was really
> leaking and now it is almost dry.  I had to go back and
> review my records to make sure but this was the sequence of
> events.  Very weird but in the event of an emergency, this
> might be a life saver (or boxer saver as the case may be).
> Seems that a lot of the stop leaks were made before the
> orange antifreeze came out and there might be something that
> just doesn't work right with the orange antifreeze.  For the
> time being, I am still using the green even though I just
> found another source for the orange antifreeze.
>
> William