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Location: 31 | I tend to agree that fogging a 4 stroke is more of a two-stroke holdover deal, although I liked Steve's idea of shooting a little fogging oil in the cylinders too.
However, IMHO an important part of the equation is how long is the storage going to be as well. One of the master Tech Yamaha recommendations I ran across was, “if you're not going to use your boat for a couple of months you should winterize”. I seized upon this, and that's why I simply run the motors warm with fresh treated fuel a couple times during the winter. I also strongly believe in and use the Yamaha Ring Free additive year-round, as well as all regular maintenance as if I lived in CA.
Years ago when I had two-strokes I did the gas treatment, fogging, and changed the lower unit oil before storage every year. That was actually fairly easy and inexpensive unlike Yamaha's recommendation before storage to change the filters, oils, treat the gas, and run the boat with their recommended fogging oil from a 2 gallon can… don't forget to wax your stainless steel prop too. 
Although I might get blasted for this, I have not been changing any oil at the end of the season either, just every 100 hours as recommended. What changed my thinking was the hour meter I installed on my new boats kicker, it was actually kind of shocking to discover how many kicker oil changes I missed with previous boats. Anyway, I just changed the oil in both motors less than 30 hours ago and everything was perfect then, so can't logically justify such redundancy.
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