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How to winterize my boat. I winterize my 4.3 Mercruiser is this video. Run stable or a sea foam through the gas long enough so it gets in the carb. Then change the lower end gear oil in my Alpha one gen 2. You want to make sure you don’t have water in your lower end or it can burst. 3rd pull blue plugs drain water from the block and pour coolant into the hose to fill the block up with a anti freeze to prevent your motor from bursting. Then I park the boat power the lower end and pull the battery to keep it on a trickle charger over the long cold winter.