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Shell Rotella is the oil of choice according to our local Yanmar dealer. I use the 15W 40 from Walmart. We tend to run our engine for long stretches at one time, not 10 minute bursts, so I change oil at about 100 hour intervals. Yanmar actually suggests 150 hours, but everyone agrees that more often can only help prolong the life of the engine. When cruising in remote places, getting rid of the used oil can be a challenge.

I looked into substitute oil filters at one time. You can get a Fram filter that fits O.K. In doing some research however, I discovered that there really is a difference in construction between a cheap filter like a Fram and a manufacturer's filter like a Yanmar. The Yanmar may not filter any better but it has metal internal parts that are unlikely to fail compared to the Fram which is all cardboard and paper on the inside.

For anyone who obsesses over oil and filters, you have your own discussion group available here

http://theoildrop.server101.com/forums/ubbthreads.php

Colin