Wix Filter/NapaGold Oil Filter vs K&N





  • K&N uses a leaf spring rather than a coil spring; the leaf spring must always seat properly onto the end cap. Additionally, a leaf spring can bend under high pressures.
  • K&N uses metal end caps rather than the fiberboard end caps.
  • The filter media inside the K&N was glued to itself, rather than crimped with a metal bracket.
  • K&N uses a phenolic resin which helps to bind the media and protect during high temperatures.
  • The center tube of the K&N filter is a spot-welded, straight seam; other brands use a spiraled center tube for better flow.
  • The K&N filter uses a silicon anti-drain back valve which is less likely to break down than the nitrile rubber valves. The anti-drain back valve is used to prevent oil from draining back to the crankcase after shutdown.


  • The K&N weighed the most of all the filters we tested.
  • The K&N had the thickest can of all the filters.
  • We found a minor amount of excess glue on element caps.
  • The K&N comes with a 1” head on the bottom of the filter for easy removal.