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I presume the oil isn't showing any coolant in it? If so, head gasket could be the issue. One of my early cars developed some play in the water pump bearing and the impeller started to oscillate just a little bit out of round. The impeller tip (iron component) started to wear the front side of the aluminum timing chain / sprocket cover and developed a squirt gun size hole that would let coolant through as soon as the coolant heated and developed pressure. Took me two dis-assemblies to find that one & only by holding the cover up to a bright back-light could I see the tiny hole that was allowing the coolant to mix in with my oil. A spot of JB Weld and it held for another year & a half I owned it. That wasn't a Subaru but sometimes things like this come down to the unexpected as far as causes goes. Good luck with your diagnosis & hope it's a relatively easy fix for ya.
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