How important is it to "Fog" the motor?

I'm not against fogging but I don't fog mine. The cyl walls are lubricated with engine oil while it's running and when it's shut down there is residue still there. I figure there is enough to protect things for a few months.
 
Summer Fun II said:
Do you guys fog your car/truck engines when you don't use them for months ??.

I don't and my 1999 car has only 87.000 mi's and it runs great. :smt001

If you live around saltwater then YES. :thumbsup:
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If I was going to leave my truck sitting for 7 months then yes I would.
 
Westie said:
If I was going to leave my truck sitting for 7 months then yes I would.
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I have a fuel injected car that is stored every winter for 6 months. Only add fuel stabil. (never fog) and always runs great.
 
Woody said:
I'm not against fogging but I don't fog mine. The cyl walls are lubricated with engine oil while it's running and when it's shut down there is residue still there. I figure there is enough to protect things for a few months.
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True. Residual oil will stick around - and I honestly don't know for how long. The fogging fluid, however, is a little "stickier" so I would think it would stay around longer. I've never done a comparison, so this is just my best, somewhat educated guess.

Just to reiterate, an MPI engine should NOT have fogging fluid sprayed into the throttle body.

The 2-cycle/stabilizer cocktail, according to Merc, was designed around that last drop of fuel that sticks around on the injectors. Merc says that does the best job of keeping them from getting fouled.
 
Summer Fun II said:
Do you guys fog your car/truck engines when you don't use them for months ??.

I don't and my 1999 car has only 87.000 mi's and it runs great. :smt001

If you live around saltwater then YES. :thumbsup:
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I do for my '66. Have never had a fuel related issue when I restart it in the spring.
 
"I have a fuel injected car that is stored every winter for 6 months. Only add fuel stabil. (never fog) and always runs great. "



Well I guess I just take better care of my stuff.
 
Maybe you could just do the "cocktail" method. Making a mixture of 2cycle oil and gas and running the engine on it for 5 or 10 minutes. The low pressure side of the fuel filter is easy to take off and substitute with hose pulling from a small container. That's what all the mercruiser manuals seem to suggest. I have an older engine so fogging take a few seconds but the newer ones I think they suggest using the cocktail over fogging don't they?

Jon
 
HighFlight2k2 said:
Maybe you could just do the "cocktail" method. Making a mixture of 2cycle oil and gas and running the engine on it for 5 or 10 minutes. The low pressure side of the fuel filter is easy to take off and substitute with hose pulling from a small container. That's what all the mercruiser manuals seem to suggest. I have an older engine so fogging take a few seconds but the newer ones I think they suggest using the cocktail over fogging don't they?

Jon
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Yep... I guess that's the preferred way to fog an MPI.
 
Seabee said:
Would fogging directly into cylinders from spark plug holes work as well?
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That gives protection to cyl. walls but nothing else.
 
You'd be missing the fuel side, though.
 
Heck, I have not fogged an engine in 20 years. But I do use Mystery Oil in my crankcase and in my fuel. That stuff does wonders. I even poor little down the carb and crank the engine over so that it fills the floats.
 
It is important to take care of your boat... Change your oil and spark plugs now and then. I found the best way to keep her running well is to use the heck out of your boat... The more hours I put on my boat the less trouble I have...
 
Ka1oxd said:
Heck, I have not fogged an engine in 20 years. But I do use Mystery Oil in my crankcase and in my fuel. That stuff does wonders. I even poor little down the carb and crank the engine over so that it fills the floats.
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You are basically "fogging" your engine. I've never used the stuff and I don't have any type of experience with it so I won't comment on it's effectiveness, or not. But what you're accomplishing is the intent of fogging - lubricating the upper portion of the cylinder and, probably most important, protecting the jets from varnish/gumming up.

And, I do agree with Rod - using an engine is one of the best things you can do for it.
 
I have the 5.0l EFI engine without a fuel shutoff. Can I use the cocktail and just turn the engine off after 5 minutes? The manual says the fuel must be shut off and the engine run dry. If it makes any difference, the boat will be unused for 4 1/2 months.

Most of the mechanics around hereI talked two fog the engine by spraying the fogging oil direct into the intake.
 
So if I just pull it out of my storage unit and run it every month or so then drain the water I should be good to go?
 
spfortjohn said:
So if I just pull it out of my storage unit and run it every month or so then drain the water I should be good to go?
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In Orange Beach, AL... YES! You should be able to use it a couple times a month this winter I would think :huh:
 
I fog my engines. I do this while I flush antifreeze through the raw water side. On my carbed motors it takes no mare than a few minutes to do. Then a bag over the carb and it's ready to sit from late Oct to Early May or so.

I have a car that sits a lot to. I don't fog that, but I also make sure to start it once every other week or so. Not to drive it around, but to just let it warm up.
 
Fogging to prevent rusting of the cylinder walls makes sense. BUT....see the video below. This was my Grandpa's old VW that had been sitting untouched under a carport for 35 years. When Grandpa passed away 2 years ago, my Dad sold it to this guy, who put a new carb on it and it fired right up.

http://www.youtube.com/watch?v=Wn8w4Nfe2Rc
 
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