There was a post on tractorbynet.com about tractor oil filters. It was done by a tractor dealer rep ( Messicks In Pennsylvania). Anyway, cutaway filter of factory Kubota vs other filters showed the Kubota filter had something like 50% more filter material, and had heavier gauge canister steel. Pretty interesting comparison.

https://m.youtube.com/watch?v=OMrI791m-pU

http://www.tractorbynet.com/forums/...s-wix-napa-oil.html?highlight=Oil+filter

"Behavior accepted is behavior repeated."

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