Wix Filter/NapaGold HD Oil Filter vs Caterpillar HD

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  • Caterpillar was the only filter to not use a coil spring.
  • The Caterpillar filter’s element was glued to the base.
  • Caterpillar uses rubber end caps.
  • The inside tube was plastic.
  • The media was not only tied together with a spring, but an epoxy was used to ensure the media pleats stayed separated.
  • The Caterpillar filter base had group holes separated by a metal fin that evenly distributes the oil flow.


  • The Caterpillar was the lightest of the HD filters.
  • The Caterpillar was the widest of the HD filters.
  • The Caterpillar had 10 holes for flow, but also had the largest diameter holes.
  • Caterpillar filters were the only to use a rubber base, rather than metal.
  • Caterpillar had the most number of pleats.
  • The Caterpillar filter was the only to use a plastic inner tube.