Wix Filter/NapaGold Oil Filter vs Mopar (Dodge)
- Mopar uses a coil spring rather than a leaf spring; a coil spring keeps better pressure against the end cap. The ends of the coil should be bent inwards to prevent damage to the can.
- Mopar uses metal end caps rather than the fiberboard end caps.
- The filter media inside the Mopar was glued to itself, rather than crimped with a metal bracket.
- Mopar uses a phenolic resin which helps to bind the media and protect during high temperatures.
- The center tube of the Mopar filter is a spot-welded, straight seam; other brands use a spiraled center tube for better flow.
- The Mopar filter uses a rubber anti-drain back valve. The anti-drain back valve is used to prevent oil from draining back to the crankcase after shutdown. A silicone valve is less likely to break down during high heat than the nitrile rubber.