Quote:
Originally Posted by BlueSkyJaunte
Filter efficacy is a balance of element surface area, particle size, and flow rate. The greater the surface area of the filter element, the smaller the particle size you can filter out at the same fluid flow rate. Getting more surface area either requires a larger filter body to fit more material or more convolutions in the element, meaning a thinner/stronger element material.
Maybe we need Lubey to chime in. 
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Don't really agree with all of this statement. The element material itself controls the size of the particle allowed to pass, not the surface area of the element. increasing flow rate is not going to give you better particulate isolation IMO. I do agree with the surface area affects on flow rate and the restriction due to the size of the filter..
To comment on Toby's post, I'd expect the introduction of a larger volume filter for the same overall oil capacity would result in lower oil pressure unless the spec filter was to restrictive in the first place.