Home Blog What is seafoam?  – How should seafoam be used, how does it...

What is seafoam?  – How should seafoam be used, how does it work


The internal combustion engine is quite complex. Air and fuel is ignited to provide motion. All these movable parts require oil to keep them well lubricated.

But, with time the fuel system gets contaminated and the fuel injectors, valves or carburetor become clogged with impurities. This reduces the car’s efficiency and you may find yourself spending more on fuel or not reaching the maximum engine output.

The car’s engine is under a lot of strain. Constant grinding of metallic parts will lead to premature wear and tear. It also leads to the development of sludge and tar. This hinders efficient lubrication of the movable parts. This is where seafoam comes in.

What is seafoam made of?

Seafoam is an additive that is an additive that is inserted into the car’s fuel or oil system to clean it off impurities. When used it will circulate through the systems clearing out sludge, tar and other impurities.

Continued use will lead to motorists noticing an increase in engine efficiency. The product has being in existence for the last 70 years and has built a solid reputation clearing impurities from engines.

How does it work?

Fuel and oil isn’t always 100% clean. It does contain some level of impurities, which with time clog the fuel and oil system. Sea foam operates as a powerful additive that has the power to dissolve any sludge and carbon deposits in the fuel systems.

These impurities are then flushed out of the system. Most ethanol additives are known to dry out the seals hence reducing efficient lubrication of the car’s metallic parts.

They do this by leaving a vanish on the seals. Seafoam works in removing this vanish hence leaving your moving engine parts well lubricated. When the additive is injected into the fuel system it will dry out any moisture hence improving the burning of your fuel. This also prevents the formation of corrosion in the fuel metallic parts.

How to use seafoam

You can use seafoam in the crankcase, gas tank or Intake manifold. In this section, we will describe procedure for using seafoam in the three locations we have described above.

Seafoam in the gas tank

We live in the illusion that they gas our cars consume is 100% percent pure. But, fuel is consists of hydrocarbons which at times leave impurities in the fuel system.

To help keep your fuel injectors, valves and carburetor operating optimally seafoam is added to the gas tank. The general rule is for every gallon of gasoline you should use an ounce of seafoam.

When added it will sweep out the gunk and leave your injectors super clean. Seafoam will act as cleansing agent, stabilize your fuel, prevent corrosion by draining out moisture in the fuel system and in diesel engines act as anti-gel or de-ice agent.

Seafoam in the crankcase

Seafoam is an additive that acts both on your fuel and oil system. The agent is powerful and if you want to maximize on its effects, you should add it to your oil system during your next oil change.

Sludge is an enemy for efficient engine lubrication. When it builds up in your oil system it makes it hard for the oil to circulate in the engine system. Sludge will prevent the efficient movement of the crankcase. When added to the oil system seafoam works by dissolving the sludge and preventing further buildup.

The practice is to use 1 ½ ounce of seafoam for a quart of oil. Seafoam is a powerful agent and you should notice immediate results once it starts running through your engine system.

Once used operates in the engine system for the next 60 miles. During this time the sludge is being broken up leaving your engine super clean. As you change your oil also remember to change the oil filters also. Seafoam is safe to use and will not react with your oil.

Seafoam in your intake manifold/front end

Your valves play an important part in fuel circulation. But, with time they do become clogged. Seafoam is the perfect additive to clean your combustion chambers, intake valves and the entire system.

To insert seafoam to the system the first thing is to identify the vacuum line. This one acts a direct feed to all the cylinders. Your car should be running when your pour in the seafoam to the vacuum line.

Keep the engine running as your pour the contents into the valve system. One third of the seafoam container should be enough to keep your valves super clean.

Switch off the engine for around 20 minutes and let all the valve systems get soaked in the seafoam. You can drive the car afterwards to see how it handles. You will know the seafoam has worked by the amount of carbon deposits in the exhaust.

Fuel contamination

When you have the right fuel in your engine you have less cases of carbon emissions. But, if you notice a white or black smoke coming from your engine it means your fuel is not being completely burned.

This leads to fuel efficiencies as you spend more money refueling your car. You will also notice that when you have a lot of un-burnt fuel there is some off-smell from the exhaust. It is normal for your exhaust to exhibit some white smoke – especially when it is cold.

The engine exhaust often condenses water droplets them emits them as white smoke. This is normal and should not be a cause of concern. This often happens the moment you switch on your ignition. However, if you find your car emitting a lot of white smoke as you continue driving then it is a sign your fuel is not being burnt efficiently.

The other major sign that you are running on contaminated fuel is your engine starts out well them stalls. This is especially the case after re-fueling.

Once this happens you should go back to the fuel station and inquire on the type of fuel they added to your car. Driving a car with contaminated fuel will lead to further destruction of the valve and fuel injectors.

When your oils system is contaminated it means it is unable to perform its role of lubrication efficiently. When carbon forms in some of your car’s valves it leads to generation of hot spots, which in turn hinder efficient fuel burning.

This means your engine is not receiving air as it should. Sludge formation prevents oil flowing well in the engine. You will experience frequent cases of the engine overheating.


Seafoam is a strong additive that has being around for the last 70 years. The fluid can be added to your fuel system, crankcase, or the valve system hence clearing any signs of carbon deposits.

Since seafoam is a very powerful agent you need to be careful to apply the right amounts. If you want to maximize the effects of seafoam you should do it during your next oil change or when you are refilling your gas tank.

The additive begins working immediately it is infused into the oil or fuel system. There is a spray version of seafoam that works well for your fuel injectors and valve systems. Many motorists often see a considerable change in engine performance the moment they start using the additive.

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Steven Reilly
Steven Reilly is a qualified mechanic and his passion for cars goes beyond just the technical aspects. He is also an amateur racer and all round car enthusiast. When he is not driving them, he can often be found in his garage under the hood of a rare model. Steven Reilly has lost track of the number of hours he has spent setting up his fine collection of rebuilt models. He believes that cars can provide a constructive and fun opportunity to teach the youth important life skills. In line with this, he is developing a community outreach program, potentially dubbed ‘Cars for change'.



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