Holy $hit, Mike - this is terrific, thanks.
If memory serves, without digging it back up, the Project Farm oil filter tests used fine flour as uniform, small contaminant, with Fram Ultra & Royal Purple testing tops in contaminant filtering efficiency & capacity, with Fram having most capacity.
BUT - I don't remember seeing flow restriction measurement. This test is shocking to see how restrictive Fram Ultra is! I submit this is not good for the oil-starved valve lifters of the Hemi, esp. during the very slow rpm of factory set idle speed.
Doesn't Champion make Mobil 1, as well as Royal Purple? Think we should take Fram Ultra off the Hemi recommended oil filter list?