Seafoam Engine Treatment for Gas and Oil

Updated on September 6, 2017

Seafoam Engine and Oil Treatment

When I was living in the Midwest, an old farmer told me about an engine and oil treatment product called Seafoam that he had been using for years and swore by. At first, I thought he was crazy, using a product in both his oil and his gas tank. But then I tried it, and I also read the many testimonials out there from others who had used it, and I've been sold ever since.

Seafoam is an additive that basically functions as a fuel system cleaner as well as an oil system cleaner. It can and should be used for both systems of the car and can really fix idling problems, poor fuel economy, gunk in the oil, and clogs in your injectors.

Seafoam needs to be used with caution, however, because of how powerful of a compound it is. This article will attempt to explain the safe practices for using it and what not to do. But if you have any hesitation, you could always just buy a bottle and take it into your mechanic the next time you go for an oil change or some procedure, and ask how much they'd charge you to use it in the vacuum line and intake manifold. It's pretty easy to use in the gas tank; just read the instructions.

Using Seafoam in the Crankcase for Engine Oil Sludge

One way that Seafoam can be used is for cleaning deposits out of your crankcase and oil system. In older cars, sludge can build up over time in the crankcase and other places where oil flows. Seafoam will help to dislodge and re-liquify these buildups so that they can be filtered out and removed. The best practice is to use 1.5 ounces of Seafoam for every quart of oil.

Please note though that if you use Seafoam in your engine oil, you'll have to almost immediately change your oil. One thing that I like to do is to add Seafoam to your oil just before I go in for an oil change. I pour in the directed amount and then drive off to where I get my oil changed, which is about 20 miles or so, which is a little bit less than recommended. Ideally, Seafoam should stay in the oil for between 30 and 60 miles of driving. This gives it enough time to break up the sludge in the oil and then to get changed out with the old oil.

The only thing you need to make sure of is that you change your oil filter as well. The Seafoam will re-liquify the old sludge and make your oil very dirty, so make sure you don't drive too far with it in your oil like this. Seafoam is safe for synthetic oils as well.

Seafoam engine and oil treatment system is really one of the best additives out there.  People really do swear by it.
Seafoam engine and oil treatment system is really one of the best additives out there. People really do swear by it. | Source

Using Seafoam in Your Gas Tank

Seafoam can also be added to your gas tank. When used in this way, it will help clean your fuel injectors and can boost fuel economy and give you a better idle. Approximately once ounce of Seafoam should be used for every gallon of gasoline in the tank. Just pour in the directed amount and drive normally. The seafoam will clean the gunk deposits as you drive and will slowly begin to boost your fuel economy and clean your fuel injectors. In addition to this, if there is water in your gas tank, the Seafoam should help to eliminate that as well, which is a nice bonus. If you're using Seafoam for the specific purpose of wanting to remove water from your gas tank, use the same amount as directed above, one ounce per gallon of gas.

Using Seafoam in the Intake Manifold and Vacuum Line

Seafoam can also be used in the intake manifold to clean your valves and your intake. This is a tricky place to use Seafoam since you have to identify your vacuum line and disconnect it. Not only that, but you have to able to identify a vacuum line that feeds all cylinders. The two lines that generally do this are the PCV hose or the vacuum brake booster line. If you aren't sure how to locate these lines, it's probably best to leave this to your mechanic. If your engine doesn't have vacuum lines, a spray version of Seafoam is also available that can be used in a similar fashion.

Seafoam can be poured directly into the vacuum line. The car should be turned on and running at operating temperature while you pour the seafoam into the vacuum line. Pour it slowly, making sure not to stall the engine. Once about a third of the can is in the intake, shut off the engine and let the Seafoam soak for 5-10 minutes. Then turn the car on again. Your exhaust should look extremely dirty. You need to drive aggressively for about five miles to rid all of the carbon the Seafoam has released from the engine components.

Questions & Answers

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      • profile image

        David 

        5 years ago

        will seafaom work on deisel engines

      • profile image

        Howard Woodard 

        6 years ago

        My daughter's 2002 Volvo V70 XC AWD w/2.4L Turbo has a plugged PCV system. There is no easily accessible PCV valve so something to clean out the system while it is running would be well worth the effort before tearing it apart to replace the system.

        Will Seafoam help with this and, if so, would it go in the fuel tank or would I need to figure out how to get it into the PCV vacuum system?

      • profile image

        Zandy 

        6 years ago

        Request the bill of sale for the "new" ennige. Unless it came from Chrysler as a crate ennige, it isn't factory-brand new.If the ennige was completely re-built by a trusted ennige re-building shop, it will get better fuel economy than a brand new one from Chrysler. Every part inside a crate ennige from Chrysler is manufactured by the lowest bidder. Chrysler makes the block but nearly all the moving parts inside are furnished by outside suppliers. If the motor was re-built and sold through an auto-parts store it is far from brand new! If this was the case, the ennige is loaded with low dollar parts and nothing was done to measure, machine or hand fit anything.Fuel economy comes from carefully selected pistons and rings and a cylinder hone hone job as per the piston ring manufacturer. The rods, (even if they're brand new) should be re-conditioned. The block decks should be trued-up parallel with the center-line of the crankshaft. The rotating assembly should be balanced. Every bearing should be hand fitted.Small enniges in big old fat heavy cars don't get as good fuel economy as a light car with a bigger ennige. Your 2000 Jeep Wrangler will never get 28 mpg on trips as will a brand new 430 hp. Grand Sport Corvette.

      • Benjimester profile imageAUTHOR

        Benji Mester 

        6 years ago from San Diego, California

        Yeah, you're probably dealing with bad gas. It really depends on how much is in the tank. If it were me, unless it's just a slight amount of gas in the tank, like less than a quarter tank, I'd siphon it out and get rid of it. It's the easiest way. It can be a hassle trying to get bad gas into a usable state, and you can sometimes damage parts if you're not careful. I'd still put some seafoam in with a full tank. It'll help scrub down the parts that have been sitting idle all winter.

      • profile image

        Cheryl Roberts 

        6 years ago

        I had a car sit too long (all winter) and it won't start. It tries but won't fire. I have been told it could be the gas gone bad. If I put SEa Foam in it do I need to take all the bad gas out by syphoning? or do I ad it to the gas and then top off with new gas?

      • Benjimester profile imageAUTHOR

        Benji Mester 

        6 years ago from San Diego, California

        Yeah, that makes a lot of sense. For me, I only really ever use it if I have a lot of buildup, so changing the oil quickly is a must. But if you want to use it on a regular basis just as a good maintenance measure, then I can definitely see driving on it until your regular oil change interval comes along. Thanks for pointing that out.

      • profile image

        guy 

        6 years ago

        Check their website again. They say you can either change it soon after using it or keep it in and change your oil on its regular interval. It just depends on how dirty your oil gets after using seafoam. That's why they tell you to check your oil often for color and cleanliness.

      • Benjimester profile imageAUTHOR

        Benji Mester 

        6 years ago from San Diego, California

        Thanks Elizabeth.

      • ElizabethSmith824 profile image

        ElizabethSmith824 

        6 years ago

        Nice post, thanks.

      • Benjimester profile imageAUTHOR

        Benji Mester 

        6 years ago from San Diego, California

        That's interesting. I had heard that and had actually gone to their website to verify. Their site says that you should only drive 30-60 miles with the seafoam in your oil. I've never gotten a can that says it can stay in there until the next change.

        If you think about it, if there really are sludge deposits in your crank case and other places, and if the seafoam does its job and liquifies them, then do you really want to be driving long distances on oil that has years of junk now floating around in the oil? If the can says it's safe, then you can definitely follow its directions, but I personally don't like driving very far distances with it in the oil.

      • profile image

        paul 

        6 years ago

        can says seafoam can stay in till the oil is changed you say to change right away

      • Benjimester profile imageAUTHOR

        Benji Mester 

        6 years ago from San Diego, California

        Haha, yeah, I'm sure it does.

      • abradford55 profile image

        Adam Bradford 

        6 years ago from Howell,MI

        nah works on mowers to im sure haha

      • Benjimester profile imageAUTHOR

        Benji Mester 

        6 years ago from San Diego, California

        You should probably start driving first :)

      • abradford55 profile image

        Adam Bradford 

        6 years ago from Howell,MI

        That sounds like some healthy stuff for your car. Ill have to check it. Thanks for sharing that.

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