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I dont think anyones arguing which filters better paper vs. cotton/oil. This is/was a discussion on green vs red. There is some debate, I will try and find it again, that the UOA is not necessarily an absolute indicator that you will damage your engine using a cotton/oil filter. I dont know the answer either.


The top of this thread mentions that the Green uses the same cotton/oil technology as the K&N. Then there is some discussuion about the filter effectiveness. I haven't seen any user data for the Green so I was sharing what I've read about the K&N (because it uses the same technology). Sorry if you felt that was off topic.

I don't consider UOA an absolute indicator myself, but I do see it as one of the few quantitive indicators available. I'm not willing to trade a potential increase in performance for potential harm to my engine.