One other pro I would add for the bypass filter and lessened oil change is oil disposal. Nordhavn reports that they have 12 gallons of used oil and were not able to dispose of oil in previous ports. When cruising remote areas oil disposal is a major problem. Another pro, is that voyaging trawler owners seem reluctant to shut their engines down on a passage (I do not understand that reluctance, but it has been expressed on the list). Captain Will described a relitatively inexpensive portiable oil analyzer. This would seem appropiate. Bob Austin, 30 foot single diesel aft cabin Carver Pensacola, FL.

I think I can defend that practically and theoretically. I would suspect that you will find the shutdown and startup phases of a machine to be orders of magnitude less reliable than the smooth running phases. This is driven by transients - temperature, shock, electrical and others that occur on cycling up or down. There are as well systems that are used only coming up or going down. Copiers run in single copy mode for instances were a factor of more than 10 x more unreliable than very similar machines run flat out as computer printers. Practically I have had boats die on a half dozen different occasions when shut down or throttled back. Many of these were "rent a boats" which are often much less reliable then better maintained personal boats. While I do not consider it a huge risk I would avoid shutting down and changing oil at sea. Jim > -----Original Message----- > From: owner-trawler-world-list@samurai.com > [mailto:owner-trawler-world-list@samurai.com]On Behalf Of Robert Austin > > Another pro, is that voyaging trawler owners seem reluctant to shut their > engines down on a passage (I do not understand that reluctance, but it has > been expressed on the list). > > > Bob Austin, > 30 foot single diesel aft cabin Carver > Pensacola, FL. > >