head gasket seep

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A friend has a head gasket seep in her NA 2004 subie forester. The plan is to get it fixed but not now. There are a variety of questionable concoctions available to fix just such a problem. Any of these safe enough to try? She is planning on keeping the car for awhile so its best to avoid clogging everything up.
 
Is it leaking oil, coolant, or both? I'm guessing it is weeping externally, as that is the common failure style of the 2000+ SOHC 2.5 engine.

If coolant: go to the Subaru dealer, buy a bottle or two of the coolant conditioner (rebranded Holt's RadWeld) and put it in.

If oil: switch to Valvoline Maxlife or Pennzoil High Mileage oil. Not likely to help with a gasket failure, but it may and they are good oils.

Also, if the Forester is anywhere near the 105k miles timing belt and assorted "while you're in there parts" (water pump, all tensioners and pulleys, crank and cam seals, reseal oil pump) I'd have it done then. The TB has to come off for a HG repair anyways.

Tips:
Have her contact Subaru of America if the car has been maintained well, she might get part of the HG repair paid for.

When the HG's are done have the heads checked and machined if needed.

Make sure that a Multi-Layer Steel HG is used in the repair, they don't tend to fail like the single layer original one does.

Check the fluids often and top up as needed. If it doesn't loose enough fluid to have overheating issues it can run a looooooooooooong time with an external HG leak.
 
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Another option to the Subaru stuff is Bars-Leak Gold powder.
Same ingredient (ginger root) and will not clock anything.
Good tip on asking Subaru to cough up something on the repair!
 
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