So, legit question aimed at the site veterans here... Seeing as this small/medium sized filter is basically proof that 20k is doable on top notch filters, or at least the Fram XG's (though I presume Donaldson's/Baldwin's best would fare as well or better), is it at all logical to assume that, a filter of the same type that is twice as big as the OP's (or bigger), could go twice as long? Like, the FL1A sized equivalent or larger?
I know I will be berated by some, but math is math... I believe that a filter of the same type or better with twice the filter media should in theory be capable of 40k judging by the fact that this filter seemingly did not fail.
And to go down the rabbit hole... Is there not any super huge filter with synthetic media and wire backing, possibly twice the size of an FL1A, that could go even farther? Are there not any 2 quart (or even 1 quart) filters for like BBC's and diesels that one could put a remote location for the filter? Yes it's excessive and I'm not saying anyone should do it, this is a hypothetical/theoretical question about the legitimate mile usage for a larger filter of the same caliber.
Sure you could call that stupid. But again... Math. It figures that way. I mean, this little filter made it 20k+.