That particular filter (yours), the bypass valve spring is badly bent. That's terrible.
Don't know what the function of the "ruffles" are. The sealing point on that particular design is the short cylindrical portion that pushes into the steel cap of the filter,
not where those corrugations ("ruffles") are. The "ruffles" are a red herring in this examination.
That bypass housing / spring looks like somebody stepped on it, picked it up and assembled the filter with it.
That is the focus item.
I had a used Endurance in the corner of my garage, so I opened it up. Same corrugations ("ruffles"), but
this one wasn't bent like yours. It took effort to unseat the short cylindrical sealing surface of the valve from the filter steel end cap.
I put it back, and tried the same "test" you did. No "light leakage." Sorry, no pic, because all I got was the flashlight illumination at the bottom of the image, no light through the filter media (it was used, ergo dark), and no light through the valve or its spring steel assembly. So, instead of a cell phone, I tried using my Canon R7, and same result.
If that is truly the way that valve came out of your sample filter, that points to a significant QA issue during assembly. Mine was working, but yours was not. But, then again, this is a
statistical sample of only two items.
Still,
no filter should leave the factory looking like that.
I ran three vehicles on these filters for this test run (along with a NOS Mobil 1 M1-207) before switching back to my usual filter (AmSOil Ea15k13), but those used Fram filters are long gone since my last set of oil changes so I don't have the opportunity to open them up.
BTW, the M1-207 posted the same ISO numbers, but over a 6,500-mile interval with the recommendation to run the oil to almost 10,000 miles (in my case, that's a full year.) Here is an excerpt from the Mobil 1 data pull:
View attachment 290475
Both filters performed similarly, but knowing that you could purchase an Endurance with that bypass valve housing issue you described and illustrated, that's not good. Mine wasn't leaking, yours had an open floodgate.
Again, I'm not usually in the habit of pulling apart filters. I just get test results from an operating engine.
Also, that table you provided shows a Fram Ultra; it's not the same filter; however, it may be subject to the same QA issues in assembly.
And again, regarding the table: what engine type(s), and how long was the oil run, and under what conditions? My samples were pulled from operating J35 V6 engines for the described miles intervals with mostly stop-and-go driving conditions, relatively few freeway miles.
OF