I have always run RV anti-freeze through the engine and drive with a homemade device I have. The RV anti freeze is safe and inexpensive. Then I open the six drains on the engine and risers let it drain and done for another winter. The only other thing I forgot to mention is I first run it up to temp with the drive in a bucket which I add CLR to and the color that comes out the first minute or so yuk. Good luck but if the weather cooperates maybe a couple of more rides on the water.
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