Oh, that's an interesting bit of Yanmar history. Sound like the "D" is plenty of engine for your boat, too. I love those Marshall catboats, by the way.
Anyway, like I said, our manual has contradictory info about the tranny oil, too. In one place it says to use ATF, in another it says to use the same weight/type as the engine oil. When we got the boat, I asked a trusted mechanic and he said that info about the ATF is incorrect and only applies to the 3HM35.
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Pacific Seacraft Crealock 31 #62
NEVER CALLS CRUISINGDAD BACK....CAN"T TAKE THE ACCENT