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 - Talk of the Town: Winterizing Engines - To Drain or Not to Drain? - by Russ Berry. What is this strange attraction I have to equipment and machinery? How did I get this way? I came from the suburbs and own a small horse farm in rural Loudoun County, Virginia. You can call me a "weekend farmer." The local farmers do. Does it bother me? No. I am just happy to have their friendship. At least the word "farmer" is in my title. But what is the attraction? How can I explain the sensation and exhilaration I feel when I turn the key and hear the engine come to life (most
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