Since I`m here in northern Texas, my winter downtime is from early November (I have not winterized yet ) to early March, about 4-5 months usually. I have NEVER fogged any boat engine I`ve owned. I ALWAYS use Stabile (a brand of fuel stabilizer). My winterization procedure consists of adding Stabile to fuel, changing the oil and filter, draining the outdrive oil and removing all water drain plugs from engine. I`ve never had a problem. But, our temps rarely get below 25 degrees at night. My current engine is way more expensive than any I`ve had before. I am seriously considering fogging the cylinders this year. It is an MPI, I was told by a Merc tech to mix gas, 2-cycle oil and Stabile in my fuel filter and run till I see smoke. You can always spray fogging oil into the cylinders, but that doesn`t get a good coat on the upper part of the valves, but it has to be better than doing nothing!