[Duffman]

This is what I do on my O/B powered boat......

-Run Stabil in fuel last trip of season.
-Flush engine on the hose and fog thru throttle body until she’s smoking pretty good.
-Change lower unit oil
-Pull prop and wrap plastic bag around lower unit.
-Take out batts and put them on a trickle charger in garage.
-Blow out fish boxes and livewell drain with compressed air.
-Dry out bilge with sponges/towels.
-Remove hoses from washown pump to let it drain.
-Throw on winter cover and call it a day.

Leave O/B in the down position and it will self drain.. no need for antifreeze.
Some guys swear by filling the fuel tank to prevent condensation. I’ve never done it. Whatever is in the tank at the end of the season is how I leave it. Never an issue with me. I change 2 fuel water separate every spring and a set a plugs and she’s good to go.