On Mon, 7 Jul 2014 02:09:43 +0000 (UTC), DerbyDad03
wrote:

Dean Hoffman " wrote:
On 7/6/14, 6:19 PM, wrote:
I have a 2001 S10. For a few years now, it has been losing coolant. I
just added a full gallon to the overflow container. I have done that
before, maybe three times now.

I see no evidence of leakage under the truck. Performance seems just
fine. I am wondering....could I have head gasket leakage? Should I
fix it? The truck has 90K miles on it, and has had zero repairs. Uses
no oil.

Thanks

Wei

Subaru had some problems with head gaskets a few years ago. One of
the fixes was just to add some radiator sealant. It was a specific
Subaru part. I bought some on Ebay.
I don't know if it was something super special or just regular coolant
system sealant with the Subaru logo.

It is my understanding that coolant system sealants can be trouble. Since
it's the job of the particles and the other sealant compounds to find small
passageways that might be leaks, they can block the actual water channels
in older radiators with already partially clogged arteries. They can clog
heater cores too.

I've always heard that at best they will buy you some time, but eventually
you will need to replace whatever was leaking, assuming that they don't
cause more problems in the meantime.
Properly applied they can litterally be lifesavers. And The heater
core on my '57 Fargo went over 20 years without a leak after adding 1
stop leak cube. The important thing is to FOLLOW DIRECTIONS. Second
important thing is to use the right product. I've never had problems
with stop-leak cube or knights alumaseal. (same stuff as silver-seal)
I am not a fan of BarsLeaks, The prestone stuff isn't bad.