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2008 Speedster Winterization. IN WATER

DieselPatton

New Member
I bought a 2008 Speedster 150 this year and I need some help. I don’t have a trailer to pull it out yet but it sits in a boat slip at my local marina. I want to winterize it while it sits in the water. I can’t find any threads on winterizing in the water, only out of the water. What is the best way to do it while in the slip? Can I reach the inlet port from the deck and manually pour the antifreeze in or start the engine to suck the antifreeze in under its own power?
Hate to sound uneducated here, but I’ve only ever owned mercruiser inboards. The dumbest question is the one you never ask, right? Thanks.
 
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