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The difference between the two holes is 1 US quart, or 1 Liter (roughly the same for this purpose). When the oil is below the bottom hole, add a quart and re-check.
Now you're also running into a peculiarity of Subaru engiens. The boxer engine has all the oil-retention issues of a V engine, but with less of the gravity assist in getting the oil back down to the sump. It takes a couple minutes to get the oil from the heads to the pan.
I check my oil at every fill-up. When I do, I pump the gas first and pay, THEN check the oil. If I check it while I pump or before, it will always read low because the oil is still in the heads.
Additionally, when adding oil, you're feeding it into one of the heads, not the crankcase, so it has to make its way down into the pan, and it's cold oil so it'll flow slower. That would account for the sudden increase in level for just a small addition.
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