Be worth writing to K&N Scott with your findings and see what they have to say for themselves, I'm guessing over oiled from factory.
I've personally never had issue with K&N filters on mine in the last 7 years, on the current one or the panel one I had before in classic and newage (both cone and panel), but I've not over oiled it, and always removed any excess oil after wicking is complete etc.
I have a do-luck foam panel one somewhere that came with masses of oil on it, but was supposedly the highest flowing filter available for a standard airbox, I was not convinced!
Certain Subaru models have been known to have weak MAFs others are known to be better, v5/6 classic for example are prone to failure,
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