Has anyone used Seafoam in the crankcase? I have heard it helps clean. If so, how much did you use and were there any noticeable results?

 

https://www.ford-trucks.com/forums/s...hlight=seafoam

I've never used it in the crankcase - and never had a reason to.

Today's oils keep engines pretty clean when changed at OEM suggested intervals. I go 5K miles between oil changes and everything has always stayed spiffy clean.

You can search for "seafoam" and find losts of post scattered all around FTE regarding it.

 

Seafoam, per their MSDS, is generally 80% non-detergent oil and 20% alcohol. I wouldn't suggest it being used in your lawnmower let alone your engine. If you have a modern fuel injected engine, you probably don't have a carbon problem as lean burn technology limits that.If you are looking for an injection system cleaner, use Techron- there is nothing better and you can ask Ford about why they and all other auto manufacturers recommend it. It does no harm, safe to use, and it works. Flooding your engine with an oil/alcohol liquid is plain nuts. Putting alcohol in the crankcase should strip the parts of any lubrication and probably will result in damage of some form. Putting it in the gas/engine should really screw up your O2 sensors or shorten their life. Most often, you don't and won't need any additives of any kind for the oil or the gas. There oughta be a law........

 

I agree with Brian,but I have to disagree w/flash(sorry flash). My engine is also changed at 5,000mi. intervals, and I had the intake off this past summer, and you could eat off of my cam, lifters, and the whole valley area. This is with, at that time,180,000mi on my '02.What was not clean however was the lower intake area with the butterflies for the short/long runner changeover. Because of the EGR ports coming out in this area, it was totally gummy, I mean pretty bad. Every time I let my engine take in seafoam through the vacuum hose, when I crank it, I can hear the small particles of carbon and gunk that is coming out of the pipes when I rev it up.

I would not use it in my crankcase, but I would pull it in through the brake booster vacuum line, cut it off, wait 15min, start it up, reve it up to clear the smoke, and drive it hard for a few miles. I think that with 193,000 miles, I can attest that it will NOT hurt your engine. Just my .02

 

Flash knows his poop, and I tend to listen to him. (never afraid to learn something am I)
But, like Thomas, if Seafoam was going to hurt an engine, it sure didn't seem to bother mine.
I used it with discretion on several occasions in my 2000.
I'd do a dose every 20,000 - 25,000 miles once I got up into higher mileage range. I didn't use it by the gallon. Sort of had the opinion that an occasional once of prevention would be better that the more sporadic pound of prevention. It was running like a top when I sold it at about 170,000 miles.
I still miss that truck...

As Thomas mentioned, the issue on the 4.2 is less of a matter of dirty fuel system and combustion chamber hardware, and more a matter of the intake runners getting gummed up.

 

Help me out here. I have a 01 E250 4.2L and it also has one of those Cylinder #4 missfire codes.I've replaced plugs and wires and now I want to try the seafoam to clean the injectors. Were is the intake hose at ? and do i just stick the end of it in the can? More details please.