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I'd have to echo what RickM says; I remember reading and article on filtering ability some time ago where they found that the filtering ability of the material used by Fram was well above what any of the others offered.
Considering that the norm used to be a new filter every other oil change (we all change our filter EVERY oil change now, right?), I'd have to go with the superior media/average construction over the average media/superior construction.
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