I had read a bit previous to Subaru ownership about the oil on a K&N sometimes upsetting the MAF, not just because of the flow issue as you may have stumbled across but also the oil itself being drawn onto the MAF sensor and hindering its ability to measure air flow.
I was always surprised that such a well known and trusted product had such reported ill affects.
I used a Pipercross filter in my Leon R as no oiling was required but I currently have a K&N in the Scoob and have considered changing it out for a while, I might be looking to do this now sooner rather then later!
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