The way an oil bath filter works (at least these work this way) is there is a mesh screen up inside the can. As dirty air is drawn in the heavier particles hit the oil and sink to the bottom while it picks up an oil mist and carries it up through the mesh. Dust attaches itself to the oily mesh screen and the oil mist that's carried up finally gets to heavy to stay there so it runs back down taking the dust with it. When the oil gets full of dirt it doesn't get sucked up as easy so the dirt doesn't get washed down as fast and the mesh builds up with an oily sludge to the point of plugging. So the can needs to come off periodically and be washed with solvent till it runs clear and the cup needs to be serviced often. Any cheap oil will work in it. 30 weight is good. The only reason the oil bath filter was discontinued was for economic reasons among other things not because it didn't work well. It is harder to make and costlier to maintain. By the way DON'T use waste oil in it as some small amount of oil is sucked into the engine and metal particles could be in the waste oil. ...Randy
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Today's Featured Article - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family’s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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