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Old 03-30-2023, 08:16 AM   #11
Nick F
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City: Vancouver
Vessel Name: Callisto
Vessel Model: 1974 Grand Banks 42 Classic, Hull 433
Join Date: Sep 2020
Posts: 589
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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