I like to run Sea Foam in my gas at a fairly high concentration (extra added just for this end-of-season run), then with the motor
still running, disconnect the fuel
hose at the motor. Let it run till it dies from lack of fuel.
+1 on the fogging oil. One can of that will last you for years. It's good in that it foams up and really coats everywhere in the cylinder. I take the spark plugs out, spray in the fogging oil, turn the motor over a few times by hand. I spray the plug
tips, too before putting them back in.
Another good end-of-season project
is to change your lower unit oil. Easy to do, and then you can be sure there's no water
in there. Enough water can crack the lower unit.