have you cut any of your filters open to see what they look like inside? i have, a fram ultra for our cars has more pleats made of thicker paper then the regular gold box mobil 1 does, the regular mobil 1 has the same number as the stp extended life at autozone. its not that its a bad filter, but that it has less pleats and less filter material then the fram which also has slightly less then the wix xp i cut open. I have yet to actually see for myself a mobil 1 20k filter as they are new. I am sure it is a great filter and not discounting your opinion but the best oil filter cannot be the exact same for every person or every need. the fram ultra does good for my 6k oil changes keeps the oil clean and filters well. the orange can of death is a horrible filter, same with the blue box stp/super guard (walmart) so are many of the other cheaper filters, cheap paper, hardly any filtering media, cheap end caps and springs and rubber by pass valves instead of silicone which withstands higher temps and is flexible longer. For my needs and i am sure most gearheads that love pulling the car on ramps and doing fluid changes a fram ultra, mobil 1, stp extended, wix xp and napa gold/platinum will work to 15k miles (as all but the stp extended life state they will, stp extended states 10k) purolator makes good filters, but thy hold the pleats with string and that is not something i want coming loose an flowing into my oil, so i dont use them. fram ultra has metal end caps good strong springs, great filter media and good gluing patterns, mobil1 and wix have these as well. the thing i like about the fram is the metal mesh covering the pleats, helps strengthen them as they get oily and flimsy (as paper, even synthetic will as it gets wet) as they age the gold box mobil does not have this, the 20k one may and i am sure does. the fram ultra filters smaller particles then the regular mobil 1 but i am sure the 20k one is the same as the fram here too.Although you brought up some good points, it doesn't matter that if Champ Labs makes a bunch of different filters. They are all branded differently and built differently according to their spec and price range.
This thread is titled Best Oil Filter. Although all synthetic media filters are good and will get the job done, I feel the best one on the market right now is Mobil 1 with its 20k capacity and superior filtration. All others like Fram Ultra are playing catchup.
Sure they are all top notch filters but you have to give credit wheee credit is due. Mobil 1 makes one hell of an oil filter. They are leading the way.
Amsoil was considered the best at one point with their 25k ratings but they've since dropped most filters to a safe 15k rating for capacity but filtration wise they are up there with M1 if not better.
I am one of those people as well no matter how much these companies claim they make things that will last 15, 20+k i am skeptical and do not trust them to know my car and its needs better then me, the owner, maintainer and driver of my car, plus mazda would know even more as they BUILT the car. These companies cannot and do not test their products on every engine and the L series engines are very unique but have flaws like everything, one is carbon build up do to running them rich so i do not trust even the best oil to keep this from happening for 10k+ miles and would rather change my oil more often then change my engine because i trusted a company that did not test their product in my engine in my operating conditions.
for 15k and under intervals any of the top line filters will do great on our cars, but again clean filters and clean fluids mean longer lasting, better running cars with less issues. changing more often is not harmful and can only assure your engine is at peak clean and peak performance. personally even with better fluids then the manual states i dont exceed manufacturers intervals as the manufacturer tested the engine in perfect conditions and most likely in real world ones and found a good range for most conditions, i hav the non skyactiv car skyactiv fill is synthetic 0w20 and even non skyactiv's should be (even though my manual states syn blend 0w20, so non skyactivs may get synblend) but it also, again depends on where you go and what your willing to pay for. Another reason i dont take my car anywhere to have it fixed or have fluid changes and prefer to do it myself because I KNOW what i put in, when i put it in, how much was put in and that all this was correct.
For me spending a little more to change my fluids and filters more often then the bottles/boxes state is a cheap insurance plan to total engine failure or major issues.
(please excuse any typo's with missing "E's" as my keyboard on my laptop is screwing up and the "E" key is going limp.) time for a new computer!