Wix Filter/NapaGold HD Oil Filter vs Fram HD

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  • The Fram HD filter 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.
  • The filter media inside the Fram HD was metal crimped to itself, rather than glued.
  • Fram filters use a paper media, not synthetic.
  • Fram does not use a phenolic resin which helps to bind the media and protect during high temperatures.
  • The gasket between the element and the base is made of an epoxy.
  • The Fram HD uses a nipple on the top end cap to seal against the base.