"Why do you change oil in the fall"
The reason is to remove the impurity's from the oil, ie carbon and acids which can form. These can attach the babbet brgs, ( main and rod) due to being alum and the crank being steel.
Change the oils in the fall and change fuel filters in the spring.
Stay away from shrink wrap, try to find heated storage.
We store our boat inside all summer and winter, I have a temperture controlled storage, 30' x 12' doesnt go above 85 in summer or below 55 in winter. Al
Supra Beast
Custom 496 MPI HO 425 hp
Custom Teak floor