Wix Filter/NapaGold Oil Filter vs Mobil 1

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  • Mobil 1 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.
  • Mobil 1 uses metal end caps rather than the fiberboard end caps.
  • The filter media inside the Mobil 1 was glued to itself, rather than crimped with a metal bracket.
  • Mobil 1 uses a phenolic resin which helps to bind the media and protect during high temperatures.
  • The center tube of the Mobil 1 filter is a spot-welded, straight seam; other brands use a spiraled center tube for better flow.
  • The Mobil 1 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.


  • We found excessive glue on element caps.
  • The Mobil 1 was one of the heaviest and tallest filters.