Was this a naked-eye "look?"quote:
I used to cut them open immediately after the change. They looked fairly new.
No sludge or debris. Very few visible particles.
In other words the filters looked very clean.
Do we even know what an overloaded, clogged filter would even look like in comparison? If not, we really have no idea what we are seeing or how "clean" it is. Clean is a comparitive word anyway...not an absolute term. If one expects large sand granules within an oil filter...all filters may "look clean" in comparison.
And to be able to determine if a filter looks "new," what would we expect an "old" filter look like? Rust? Probably not....then what?
Also, could there be degredation to the media that is not readily observed just by looking at it with the naked eye?
Lots of questions.......