The quality of content as well as the production value of that oil filter comparison video was amazing. Wish more internet content consisted of well-researched and presented information like that.
In regard to why flow restriction differed so much between Mobil 1 and Fram Ultra, the Mobil 1 advertises 99% efficient at
30 microns, while the Fram Ultra advertises 99% efficient at
20 microns. Surely that would explain things, at least in part?
It seems the original rankings of oil filters in the dusty early days of this thread were based on filtering efficiency and capacity. The new test video
@Burla posted shed some light on the tradeoffs of running a filter with high efficiency, that being higher flow restriction. I share
@HEMIMANN's concern — given that the #1 concern with the HEMI is poor lubrication and flow to begin with, does this mean a high efficiency filter is the wrong call?