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Old 08-13-2022, 11:49 AM   #5
Lepke
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City: Between Oregon and Alaska
Vessel Name: Charlie Harper
Vessel Model: Wheeler Shipyard 83'
Join Date: Jun 2016
Posts: 3,023
I've been using bypass filters since the 1960s. Before 1955, most car oil filters were bypass only. Older Detroit Diesels (Gray Marine) engines were bypass only. Bypass filters best effect is reducing particle size and that leads to less wear. I've run several engines thru multiple rebuild cycles with bypass filters and always get more hours than others using the same engine in the same way. Usually close to double hours.
If you cut open your filters after changing you'll find they retain some water in the bottom. Adding a bypass filter holds a little more. It's good to get water out of the oil system.

Now I use a centrifuge and haven't actually changed oil since 2011. Just make up oil. I do change the filters about once a year and do oil tests. My oil is transparent.
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