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Surfstar - which K&N knockoff are you using?
I originally ran a " Ractive " brand, heat shielded cone filter. My UOA on that one was 6 Si over 4500 miles IIRC. I cleaned/oiled it once (40k miles?), then after reading some "over-oiling" posts on here, got worried, bought a clone of that filter off ebay (looks exactly the same w/o the brand name) and have been using that one.
And as far as over-oiling - I would take my filter off, clean it, let it dry for a bit, then completely spray/soak the thing with K&N oil, but let it sit overnight to soak/drain before reinstalling. NEVER had a problem with oil getting past the filter and in the intake or on the MAF.
edit: I forgot to mention, I've done the tissue wipe test downstream of the filter a couple times, comes out clean as can be. And my car is up to 213k miles and AVERAGES the EPA hwy MPG with mostly 75mph hwy miles.
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