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P.c.v valve is a Positive Crankcase Ventilation valve and its just basically a one way valve and if it gets stuck open it sucks oil into the intake and burns it. Rings rarely fail on these subarus unless its been badly abused.

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+1 on the PCV valve/system.  Something else to check (along with the PCV valve) is where the PCV hoses attach to the valve covers:  The metal tube on the cover tends to accrete crud, narrowing the opening.  This can cause oil to pump up into the PCV hose and get sucked into the engine.

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