I am a relatively new boat owner and will be attempting my first "nautical" oil change this summer. The oil filter that is currently on my '89 Sea Ray, Mercruiser 4.3L has no markings on it and I could not find any references in any of my manuals for it. I don't want to pay the inflated price from the boat dealer. I was just planning on getting one from the auto parts store, but don't know what size. Anyone know this info or where I can get it?<br /><br />Thanks<br /><br />Jeff