Wix Filter/NapaGold Oil Filter vs MotorCraft (Ford)
- MotorCraft 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.
- MotorCraft uses metal end caps rather than the fiberboard end caps.
- The filter media inside the MotorCraft was crimped to itself, rather than glued, and a string was loosely tied around the media.
- MotorCraft uses a phenolic resin which helps to bind the media and protect during high temperatures.
- The center tube of the MotorCraft filter is a spot-welded, straight seam; other brands use a spiraled center tube for better flow.
- The MotorCraft 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.
- Excessive glue was found where the pleats meet end caps.