2006 Mercury four stroke engine fogging

[Cleatus61]

I don't have a owners manual for my boat. I just bought it used and didn't a owners or service manual with it. From everything I have researched, I have been getting conflicting opinions on fogging a 4 stroke. Some say to fog, some say not to fog because it's will damage sensors. Right now I am leaning on not fogging and just removing the plugs and spraying fogging oil or WD40 in the cylinders. What does the owners manual recommend?

[Silvertip]

How long is the layup period and where on the planet are you located? On a short layup fogging is not necessary.

[Cleatus61]

I live in Michigan. Lay up is 4 months.

[Silvertip]

Not really necessary but if it makes you feel good do it. Don't run fogging oil through the air intake. A squirt in each plug hole would suffice.

[Faztbullet]

From the service manual: (note I use fogging oil shot into sparkplug hole and never had a problem)

Fuel System
IMPORTANT: Gasoline containing alcohol (ethanol or methanol) can cause a formation of acid during storage and can damage the fuel system. If the gasoline being used contains alcohol, it is advisable to drain as much of the remaining gasoline as
possible from the fuel tank, remote fuel line, and engine fuel system.
Fill the fuel tank and engine fuel system with treated (stabilized) fuel to help prevent formation of varnish and gum. Proceed with following instructions.
1. Portable Fuel Tank – Pour the required amount of Quicksilver Gasoline Stabilizer (follow instructions on container) into fuel tank. Tip fuel tank back and forth to mix stabilizer with the fuel.
2. Permanently Installed Fuel Tank – Pour the required amount of Quicksilver Gasoline Stabilizer (follow instructions on container) into a separate container and mix with approximately one quart (one liter) of gasoline. Pour this mixture into fuel tank.
3. Remove the fuel filter sight bowl (see “Fuel Filter” above) and empty contents in a suitable container. Add 3 cc (1/2 teaspoon) of gasoline stabilizer into the fuel filter sight bowl and reinstall.
4. Place the outboard in water or connect flushing attachment for circulating cooling water.
Run the engine for 15 minutes to allow treated fuel to fill the engine fuel system.
Protecting Internal Engine Components
1. Remove the spark plugs and inject a small amount of engine oil inside of each cylinder.
2. Rotate the flywheel manually several times to distribute the oil in the cylinders. Reinstall spark plugs.
3. Change the engine oil.
Gear Case
1. Drain and refill the gear case lubricant (refer to maintenance procedure).
Positioning Outboard for Storage
Store outboard in an upright (vertical) position to allow water to drain out of outboard.

[Cleatus61]

Thanks for the advise everyone.