Pontoon Plans Will My 20ft Pontoon Boat Be Ok In A Wet Slip At The Lake All Winter?

Will my 20ft pontoon boat be ok in a wet slip at the lake all winter? - pontoon plans

I live in Texas and got my boat on Lake Tawakoni. My plan is to change the oil and fat per unit is lower, and most likely make an adjustment. If you would be well into the water during the winter, I cut the engine all the way up or down? I have a 50 hp outboard motor Nissan.