My understanding is that the Puradyne filters are much finer than the main filter. Because of the back pressure that the full flow would cause, the Puradyne filter is plumbed as a "bypass" filter (in parallel with the oil circuit). In the long term the smaller particles that can pass through the main filter are removed by the Puradyne filter.
Bottom line: you would be filtering to a finer filtration level.
As the Puradyne literature says, oil change timing would be based on oil analysis results (and not, say, engine hours).
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