MADMIKE, The ExtendedGuard SPE is rated the same as their baseline Extra Guard. I like the media for holding capacity but the filtration is ~average (aka as good as 'the' leading filter brand which IS FRAM). Construction appears to notch as you say.
So SteveC...this would not be a good substitute for EaO if fine filtration is your goal. If FRAM spec'd it to the same MPE as their ToughGuard it would be competitive with EaO, I believe. If so, I would likely buy it at $7-8.
I think FRAM's concern is liability of fine filtering while trying to extend OCI. 10um filters grab lots more 'stuff' and they sell to mass market. I don't think EaO or RP filters are mass market so they expect more user diligence and corresponding less liability.
So SteveC...this would not be a good substitute for EaO if fine filtration is your goal. If FRAM spec'd it to the same MPE as their ToughGuard it would be competitive with EaO, I believe. If so, I would likely buy it at $7-8.
I think FRAM's concern is liability of fine filtering while trying to extend OCI. 10um filters grab lots more 'stuff' and they sell to mass market. I don't think EaO or RP filters are mass market so they expect more user diligence and corresponding less liability.