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I have both the Yanmar Operation Manual and the Service Manual for your engine right here. They clearly state that the transmission coupled with the 2GM20F should use the same weight Motor Oil as the engine. Not until you bump up several sizes to the 3HM35F do these manuals call for ATF.
HOWEVER, if you want to know without a doubt, Kanzaki stamps the required fluid into the backside of the transmission housing, just above the output shaft.
In my case, with a 3GM30F and a KM3P transmission, the service manual states to use whichever weight motor oil is being used in the engine. But the stamp on the transmission housing indicates 20W/30. I suspect you will find the same info on your KM2P.
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Pacific Seacraft Crealock 31 #62
NEVER CALLS CRUISINGDAD BACK....CAN"T TAKE THE ACCENT
Last edited by JohnRPollard; 12-16-2008 at 03:18 PM.