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Jay,
Thank you for posting the video. For those of you that didn't watch it, it's a pretty good breakdown of filter anatomy and is worth a look.
I do have a few questions for you after viewing:
1.) Why is the regular orange filter not rated for synthetic oil? Due to change intervals?
2.) If cardboard end caps are just fine and have better adhesion to the media due to similar materials and apparently no down side, why does Fram use metal end-caps on their top of the line filter (Extended Guard) and not fiberboard?
3.) Big one for me- What part of the filter anatomy would cause a fluttering in hot idle oil pressure? I ask this because when I used to use Fram filters my car would have slight instability in the gauge at idle, and after switching to another brand it completely went away. Same engine, same milage, same oil- even the same day. Just a different filter. For the record, I don't run a purolator anything either.
Thanks for your input.
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