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Old 12-23-2006
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Most of what you see on marine diesels are not filters but 'silencers'. Even in the middle of the ocean, air is 'dirty' and containes a lot of hard submicronic particulate - especially if there is a desert or volcano upwind. Does this affect the service life of an engine ... probably not as these particles are extremely small and approach being 'harmless' to the engine as they contain little inertia / mass once inside. If you are keen to actually put a FILTER on the engine you can apply 'retro-fits' such as the dry paper elements from such manufacturers as "K&N", etc. ... just be sure to well 'oversize' the filter ... based on 'cubic ft. per miniute' of volumetric aspiration of the engine at 'wide open throttle'. Forget about 'wet' or oil-bath filters as they are essentially 'worthless'.
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