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I really do not know. There has to be some point where flow and filtering cross. I would bet that Donaldson has done their homework on this one to have it just about where it needs to be. They probably could add more filtering ability but at what risk. Probably would not hurt for short oil changes, but for extended drains like this was designed for, you want all the safe flow you can get.
I would contact Amsoil first, then Donaldson with this question. I'm sure one or both of them have all of the testing they did before they decided, this is it.