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Message: <blockquote data-quote="Jrgunn5150" data-source="post: 489429" data-attributes="member: 9682">In a normal engine, all of the oil does not get filtered. It's why there are relief valves, etc in the filter. If the filter got clogged, motor death in about a mile. Dirty oil is better than no oil.A bypass filter is an additional filter, run's off a small line, usually off the pressure port for the gauge. It filter's finer than the regular filter, and nothing is allowed to not go through it. If it clogs, no big deal, since it's not in the main circulation of oil.People using bypass filters are having independent lab verified results showing clean oil after as much as 50k miles.</blockquote>