Fogging Fuel Injected Engine

[CurrentSea]

So what's the deal with Fogging.
I hear so many viewpoints.

1) Don't fog.
2) Fog with mixture attached to fuel ine.
3) Fog with 50/50 mix of marvel mystery oil or 2 cycle oil in fuel filter.

I have 2007 volvo 8.1.

I like the simple approach of #3.
Last year I didn't fog and I had no issues starting this year, no rust, engine was fine.

 

[Gregory S]

I don't fog for the short layup period we have here--Nov to March/April.

 

[mixman]

I'm with Greg. I think fogging might be over-rated. Granted, my outboards are totally different than what you're talking about, but Honda is totally against fogging. 6 years with this boat and no issues without fogging. But then again, like Greg, we have a much shorter lay-up here in the mid-Atlantic (and we sometimes boat 10 months, weather permitting).

That being said, what does Volvo recommend?

 

[Michael Clemensen]

I’ve been fogging on winter layup since ’96, this is the formula that I use just reduced to be only one gallon of fuel. From the Volvo/OMC Shop manual, additionally this is pretty much what George posted years ago as the elixir that he used.

FSi and Gi Models
Prepare an engine "storage mixture" in an outboard V6 six gallon fuel tank. It must consist of 5 gallons fuel; 4 pints (64 oz.) OMC Storage Fogging Oil; and 1/3 cup (2.5 oz.) OMC 2+4 Fuel Conditioner. Mix these ingredients thoroughly.
• Disconnect boat fuel line at engine fuel pump. Run engine on the "storage mixture" for approximately 5 minutes at 1500 RPM. This will ensure that all fuel system and internal engine components are thoroughly protected. Shut off engine before the "storage mixture" is used up.
NOTE: Do not run engine out of fuel. The electric fuel pumps will be damaged.

 

[David M]

I fogged my Regal. For the spring tune up, I wanted to order Iridium plugs. GVP told me not to waste my money as fogging destroys iridium plugs. Just something elst to consider in the equation.

 

[HOGAN]

Only "fog" through the fuel line, not by spraying fogging oil through the air intake.

 

[Jim D]

I stopped fogging my engines a couple of years ago. IMO,unless you are winterizing the engines for more than 6 months, I think it is unnecessary and does more harm than good by ruining the spark plugs. And since the spark plugs on my generator cost over $20 a piece ....

 

[Prospective]

My mechanic always fogged my volvos in the fall and changed out plugs in the spring. Not cheap. And upon reflection I realized I don't bother "fogging" anything else that sits over the winter like my tractor. Maybe if it was going to sit for a year but less than that I don't think I would do it again if faced w/ the choice.

 

[JVM225]

I don't think you need to fog.

 

[DarinSchmidtMN]

Even the boat builders quit fogging engines. Merc recommends to the OEM builders not to fog the EFI engines, so they don't do it anymore.

 

[mandm1200]

I fogged my engine since new, 1992. It is carburated so it's not the same procedure as EFI but the end effect is the same. I use the spray can of fogging oil. Original plugs lasted 16 years without issue; new spark plugs made absolutely no difference. Fogging gives the engine a slight coating of oil which will prevent rusting. My boat sat 4 years unused becasue of marital issues. Am I glad I fogged it? I did a compression test last weekend which is 4 years since the unexpected layup. All cylinders were between 138-150 psi. I also use an oil additive for the crankcase. It does a similiar thing for the lower end.