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Bypass oil filtration is when you install a very restrictive, high filtering medium in parallel with the oiled parts of the engine. A small portion of your oil flows through it, so it takes a few dozen passes before most of your oil has passed through.
I read about toilet paper roll filters on BITOG, where they were not ridiculed as worthless. But if you can't get the necessary additives, they kind of are worthless.
Me, I think I can live with the Insight's 2.5qt oil change every 10kmi/1yr. The additional weight of a bypass filtration setup (8lbs?) would be very hard to justify.
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