Stern drives are more complex than outboard engines because they require water removed from the block and driving unit. You may also need antifreeze running through it all and making sure everything’s coated with enough for harsh winter weather.
There are quite some differences between the different makes and models, which can be significant, so you’ll want to consult your owner’s manual.
Removing block plugs will help you drain the engine and remove sediments that can build up inside.
In addition, you’ll want to take some time to thoroughly check exposed parts like hoses and clamps to ensure that everything is functioning as it should be after playing all season long.
The engine needs to reach operating temperature before fogging it, and you should also bring the engine’s operating temperature up to “cook” out any moisture that may remain inside.
Oil changes are practically essential for the longevity of your engine. Make sure you take that step with an informed decision, too.