I fell the clamp on K & N is a better connection than the stock filter. The stock filter could easily suck un-filtered air at its connection to the tube. I have not noticed any gain in HP. I have six vehicles all with K & N's. I have used them for a good decade. Oil on a mass sensor is unlikely unless a person would really over oil a filter.
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Yellow Lux H3, w/Adventure Pkg, Borla, K&N.
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