My 2001 had the HG done at the dealer all the dealers were using updated gaskets in late 2000 if I recall correctly. And they were not leaking oil! They were leaking coolant externally.thanks for all the suggestions. yep, the original replacement was a subaru job under warranty probably used subaru gasket also (unfortunetly).
until I get more time to investigate myself and a thorough cleaning of it all, it is a slow leak, as originally thought so i'll just be adding oil. I'm ok w/that.
I do realize the coolant additive wouldn't affect the oil, just the gasket and squeezing as much life out of the gasket where i could was the thought. I prefer not using any additives anyway where possible. just picking on all your experiences.
thanks everyone and enjoy your evening!