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my problem with this is that filter isn't designed to retain liquids)
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I'm not sure what you mean by this. I don't see why it would have trouble holding liquids.
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my guess is only about 1-2oz can fit inside the filter
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A BITOG member claims 26oz. It's a massive can, and the L40017 is even larger.
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filters are designed to be positive pressure (oil is pushed through them)
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Filters see only relative pressure, and I'm still running it in the same direction.
You're right that I can't let it fill up, but that's true of any catch can.