Go to your nearest Subaru dealer parts department
and request 2 bottles of their Cooling System
Conditioner.  Empty about a pint or so of coolant
from your expansion tank (not the overflow tank) so
that you can pour in one of the bottles (engine
overnight cold).  Run the engine for about 3 minutes
but shut it off before the thermostat opens.  Let
it sit for several hours.  I leave mine over night.
Then drive it over the next week and see if there's
any more leak.  If so, repeat the procedure.  That
should do it.  You may want to bleed the system a
bit after this.

Good Luck,

Steven
--- Mark Brush <mbrush@GMAIL.COM> wrote:

> Hi all -
>
> Anyone have experience with pushing leaking head
> gaskets to the limit?  How
> long can one expect to resonably drive with leaking
> head gaskets?  It's a
> tiny drip in the summer (about a susan b. anthony in
> size on the driveway
> after two days), and a small puddle in the winter.
> Can I keep adding
> coolant until she goes?  Any dangers in doing this
> other than being stranded
> somewhere?
>
> thanks for any insights.
>
> Mark B.
> 1990 Westy
>

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