My 2002 Forester EJ251 (which I bought new) gradually seeped oil from the head gaskets. Nothing major, but it did require occasional top-up. Lower left-side was the worst.
At 140,000 miles I had the engine out to replace the clutch, and put in MLS HGs at the same time.
Since then (about 5-years), the HGs have been tight, not even a hint of seepage.