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I don't know the layout of your particular engine, but if you have a heat exchanger, it will require winterization as well, plus possibly the thermostat. Contact your engine maker.
Also, you might want to pour antifreeze in the water muffler, and, after you dry it out, put some in the bilges. If water seeps into the boat in the winter, it won't freeze in the bilges if it meets undiluted anti-freeze. This advice is unnecessary if you have a garboard plug, but few modern boats do.
It is simpler to winterize FWC cooled engines, because you can simply do the raw water circuit and pour antifreeze in the expansion cap in the heat exchanger.
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