As per our NAPA (WIX) filter rep when NAPA quit Purolator and got thier own brand (some time in the '60's or early '70's.) An "oil bath" filter is about 25% efficient at best. They work best at full throttle when the air is moving fastest. At low air speed, they are next to useless. The air changes direction as it passes over the oil cup, the dirt is thrown into the oil by centrifugal force, and held there. The mesh has a tiny bit of oil, but is mostly to catch the grasshoppers and such. There is no actual bath, but they were state-of-the-art long ago. Paper filters are about 95 to 98% efficient, and work at any volume or speed of air. In extremely dusty conditions we would mount an oil bath filter on top of a stack, and feed that into a FARR paper filter, the best at that time. Hope this helps.
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Today's Featured Article - Chores - by Frank Young. The ceaseless passing of time! It is at once our friend and our enemy. It measures our progress and it makes us old. Like most features of our life, few things are all good or all bad, and most such judgments depend on our own perspective or viewpoint. In our particular hobby, we enjoy the nostalgic return to the days of our youth as we recreate many of the scenes that took place on the family farm that served as the stage for the first few acts of the play that is our live
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