Those FB20 and FB25 engines were known major oil consumers, but like the poster above me said, some were really bad, some were ok.
A few years back, I was on a road trip, and an old lady was in a quick mart at the gas station, and she was totally lost looking for oil. She had just bought a used Forester with the FB25 and she said her oil light was on. I showed her which oil to get and had her get 2 quarts to put in the engine. And I made her do it so she knew how because I told her unfortunately she would probably have to do that from time to time.