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Ford Explorer Community - Maintenance - Modifications - Performance Upgrades - Problem Solving - Off-Road - Street
Explorer Forum Covers the Explorer ST, Explorer Sport, Explorer Sport Trac, Lincoln Aviator, Mercury Mountaineer, Mazda Navajo, Ford Ranger, Mazda Pickups, and the Ford Aerostar
One's oiled and one's not.. it changes the filtering capabilities, some people don't like oiled because of the risk of over doing it and getting oil into the maf and other things.
The oiled filter needs to be oiled in order to allow more airflow, while also filtering almost as well as a paper filter. However, as the oiled filter collects more dirt, it's performance decreases quickly. The Amsoil EaI filter does not have quite as good airflow as the oiled filter, but is supposed to provide a much flatter curve as it gets dirty. Theory behind it is that the holes in it are much smaller, so particles hit the outside and don't get embedded in the filter as they will with a paper and oiled filter. That's the theory anyway. Less mess to deal with than oiled anyway, and you only need to vacuum it off once a year.