thank you for chiming in with 'real world reasonableness.'

Leak reducing additives have their place when used appropriately and
with reasonable expectations.

On 2/24/2012 9:20 AM, Mark Dearing wrote:
> well sorry but I have seen the subie coolant treatment stop waterpump
> leaks,  had it do so on my own 88 fox lasted well over 8 months. also have
> seeen it work on the wbx inner o rings and clylinder gaskets , as well as  the
> bigger head seal gasket ,but not as well mostly if the leak there is  massive
>    later  mark d
>
>
> In a message dated 2/24/2012 12:02:59 P.M. Eastern Standard Time,
> d23haynes57@HOTMAIL.COM writes:
>
> Coolant  sealers and stop leaks do not work on water pump seals as they are
> a
> moving  seal, not a hole to be clogged. Also once the water pump does leak
> the  coolant can work into the bearing wiping it out quickly.
>
> Also the  vanagon water boxer has absolutely nothing in common with head
> gasket  design so no Subaru benefit here. Most any coolant sealer will work
> on the  outer gasket as long as it not beginning to tear or split  open.
>
> Dennis
>