Cummins has an interesting set of addon devices that they say enable 4,000 hour service intervals on some of their marine, and I suppose other, diesel engines. They are:
-Centinel which is an integrally plumbed oil system that burns a potion of the in-service lube oil and replaces it with new incrementally over time.
-Prelube with QuikEvac which stores oil under pressure while running and prelubes on restart (ala Accusump). As the name suggests it also quickly removes the sump contents (presumably at the 4,000 hour point, I'm guessing).
-Eliminator which has a 20 micron full flow stainless steel non-replaceable filter allied withva centrifugal separator to remove the rest. Thus, no throwaway filters.I
All three are used in combination to reach the aforementioned 4,000 hour interval "when used with an approved oil sampling program".
https://cumminsengines.com/marine-eliminator
And then look down on the right side of the page for the other accessories.
-Centinel which is an integrally plumbed oil system that burns a potion of the in-service lube oil and replaces it with new incrementally over time.
-Prelube with QuikEvac which stores oil under pressure while running and prelubes on restart (ala Accusump). As the name suggests it also quickly removes the sump contents (presumably at the 4,000 hour point, I'm guessing).
-Eliminator which has a 20 micron full flow stainless steel non-replaceable filter allied withva centrifugal separator to remove the rest. Thus, no throwaway filters.I
All three are used in combination to reach the aforementioned 4,000 hour interval "when used with an approved oil sampling program".
https://cumminsengines.com/marine-eliminator
And then look down on the right side of the page for the other accessories.