Seafoam Reviews: The Truth About Seafoam (All You Need to Know)

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Seafoam Reviews: The Truth About Seafoam (All You Need to Know)

Does seafoam really make a difference?  Seafoam has gained a lot of both positive and negative review over the year and this article I will give you a full detailed seafoam reviews. This is me basically laying out all the truth about seafoam.

We will go through what seafoam is and how to use it and down to answering some common questions about seafoam.

Seafoam Reviews: The Truth About Seafoam

What is Seafoam and What Does Seafoam Do?

 Seafoam can be described as a fuel additive that helps to improve your car’s efficiency. With constant use of your car, the fuel and oil will get contaminated.  Seafoam helps to get rid of deposits from your fuel and oil system, keeping it clean. It helps to reduce the carbon emissions from your car.

When continued use of your vehicle causes the formation of sludge deposits in the combustion chambers, Seafoam comes to the rescue. During the next service, seafoam is added to the gas tank during refuelling or the oil filter. Seafoam cleans the engine without inferring with the fuel or oil.

The seafoam brand has been in use now for the past 70 years to clean engine and remove fuel and oil deposits. Fuel and oil are not completely clean and sometimes interact with contaminants like dirt and other deposits to produce sludge, with eventually reduces the efficiency of your engine.

Chemical composition of Seafoam?

Seafoam comprises of pale oil, naphtha, and IPA. Sea Foam Motor Treatment and Sea Foam Trans Tune both consist of the same three components, but they use faintly different ratios.

Seafoam motor treatment is made to liquefy sludge deposits so that they can carefully be expelled out of the engine. Ethanol additives causes your seals to dry out, making them difficult to be lubricated. However, seafoam will absorb water, improving the air/fuel ignition.

Does Seafoam Really Make a Difference?

Clogging of engine is a common occurrence with the internal combustion chambers and the crankcase and pistons require to oil to function properly. Oil needs to be applied to all mobile parts.

It is wrong to keep on using your vehicle with oil clogs up the engine and fuel systems. It will lead to valve malfunctioning because Carbon deposits will impede engine performance through ineffectual detonation. It will de-ice the fuel system when used in diesel engines.

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Seafoam Reviews

Advantages of Using Seafoam

  • Seafoam is fit for both gasoline and diesel engines
  • It is a very useful cleaner and suitable for numerous tasks
  • Seafoam is a renowned and recognized brand with great customer support
  • The price of seafoam is affordable and products come in a large assortment of different sizes and bulk packs.
  • Seafoam is suitable for gasoline and diesel engines
  • It can be used with carbureted and fuel injected engines
  • the Seafoam is suitable for just any type of machine engine maintenance from cars to leaf blowers.
  • Seafoam is not just a fuel additive, but it is also suitable for use in oil crankcases
  • Normally Seafoam cleans injectors, passageways, intake valves and pistons
  • It helps control engine moisture and it is anti-corrosive
  • It functions as a de-icer and anti-gel
  • Seafoam stabilizes fuel up to two (2) years.

 Disadvantages of Using Seafoam

  • Seafoam may lack some cleaning power as a general cleaner
  • The process of cleaning the engine using seafoam may be hard for learners

The Sea Foam Company has refined its products to the highest possible standard over 70 years. Sea Foam products are perhaps some of the most popular in the whole industry. The Sea Foam Motor Tune-Up is an extremely multipurpose liquid with 100% petroleum-based blend. It can function as a fuel injector cleaner, stabilizer, lubricant, and moisture controller.

Seafoam may not be the strongest cleaner, but its versatility is top-notch, with an affordable price. This product can be applied in so many different ways and for so many different engines.

How to use Seafoam

  • To use seafoam as a fuel additive, pour 1 oz. of liquid into your fuel tank per 1 gallon of fuel.
  • To use seafoam to for cleaning your engine, slowly pour small amounts into the vacuum line, fuel line or air intake system of gasoline engines at operating temperature
  • Never pour liquid into Diesel Engine air intake systems
  • To use for oil treatment,  add 1.5 oz. of liquid per 1 qt. to oil crankcase
  • For additional applications, use the Sea Foam Spray, to access hard-to-reach engine parts.

Is the gasoline additive Sea Foam effective?

If your engine needs cleaning, adding seafoam will be effective, but the problem with seafoam is that it may knock lose a big chunk of oil sludge and jam an oil galley, line, or sludge up your oil filter and force open the bypass valve.

You can simply change your oil if your engine just needs a little cleaning instead of adding seafoam. You can use fresh engine oil which does more than just lubricate:

  1.  It cleans and suspends the carbon blowby and has detergents to clear any accumulation. The carbon ends up being drained with the oil.
  2. Some pistons have fins on the backside, so this oil can help cool the exhaust valves
  3. It lubricates
  4. Will lubricates and protects the engine parts from air and moisture
  5. It contains anti-acid additives

 Note that none of the engine manufacturers recommends adding things like seafoam because it’s not always too good for you to use on your engine.

If your engine requires cleaning, just increase your oil change frequency and let the new engine oil to gradually break up the dirt.

Alternatively, you can open the engine and use your hand to do the cleaning.

Most Commonly Asked Questions on Seafoam Usage

Should I use Seafoam in my gas tank?

For routine fuel system maintenance, just 1 (one) can of Sea FoamMotor Treatment is able to treat up to 16 gallons of gas or diesel fuel. When much cleaning is needed, add more Sea Foam. Adding more quantity of seafoam to fuel cleans it better.

Is seafoam a good fuel injector cleaner?

Yes, seafoam is a good fuel injector cleaner. You can pour Sea Foam Motor Treatment into your fuel tank (1 oz per gallon of fuel) directly to add lubrication. Control moisture and stabilize your fuel. Also note that it works perfectly well with both gas and diesel engines. Fuel Injector Cleaner helps to increase power.

How good is seafoam?

If you add more Sea Foam to fuel, it would be perfect for cleaning a gasoline or diesel fuel system. The more Seafoam you add to fuel, the better it cleans. It works through fuel injectors and carburettors to get rid of damaging residues and deposits from fuel intake valves, passageways, chamber areas, and pistons.

When should I use seafoam?

For regularly-driven autos and trucks, add one or two cans of Sea Foam to fuel every 2,000 to 5,000 drive miles.

For regularly-used engine equipment, add Sea Foam to a tank of fuel every 3 months or earlier.

 What does seafoam do for engines?

Sea Foam is specifically formulated to safely and gradually re-liquefy gum, sludge, varnish and carbon deposits from the hard parts in your engine so they can be completely eliminated from the system. Sea Foam helps lubricate the mobile parts in the fuel system.

Does seafoam ruin spark plugs?

Seafoam can cause a bad plug in extremely rare occurrences. Seafoam doesn’t really damage spark plugs, but since your engine is producing so much heavy carbon smoke, if a plug was on its way out, it can completely push it over the edge.

Can you leave seafoam in your oil?

Though it is recommended to add Sea Foam to oil 100 to 300 miles before changing your oil, it will function effectively to add it in your oil for as long as the oil will last before your next oil and filter change.

 Is Sea Foam toxic?

Most sea foam is not dangerous to humans and is often a sign of a productive ocean ecosystem. However, when large harmful algal blooms decay near shore, it can negatively impact upon human health and the environment.

Should I seafoam my engine?

No. You shouldn’t seafoam your engine. You should never use Seafoam to clean fuel injectors. There are better products to use.

What is Seafoam engine treatment

The Seafoam manufacturer lists three ways it can be used:

  • poured into the crankcase to get rid of crankcase deposits
  • poured into the gas tank to clean fuel injector
  • sucked into a vacuum line as an upper engine or top engine cleaner.

Seafoam engine treatment product safety sheet, according to MSD, comprises of three liquids namely Pale Oil 40-60%, Naphtha 25-35%, Isopropyl Alcohol 10-20%.

This means that it contains a solvent, a lubricating oil, and alcohol. All three products can act to break up engine deposits.

Seafoam engine treatment as an engine cleaner

If you add Seafoam to your oil, it can dissolve buildup and deposits in your crankcase.

Sounds good, right? Well, towards the end of this article I discuss the pros and cons of using an oil additive to do that.

Seafoam engine treatment added to your gas tank as a fuel injector cleaner

The two most effective fuel injector and fuel system cleaners are polyisbutylamine (PIBA) and polyetheramine (PEA). Seafoam doesn’t contain either of them. The Naphtha and alcohol components can act as solvents to clean deposits from fuel injectors, but I believe they’re not the best cleaners for fuel injectors or carbon deposits. I’m not sure how the Pale Oil helps clean fuel injectors, but keep in mind that Seafoam engine treatment claims that their product can be used in multiple ways, so as a fuel additive, perhaps the Pale Oil rides along for free and burns like ordinary fuel.

Seafoam engine treatment injected into a vacuum line for top-end cleaning

Seafoam engine treatment is applied to the back of the valves of the gas tank by the fuel injectors in non-direct injection vehicles. However, when used in a vacuum line, Seafoam engine treatment comes into direct contact with all the inner mechanisms situated in the intake manifold. This means that the solvents have the possibility to contact and clean valve stems and the back of each intake valve.

Seafoam added to a tank of gas won’t hurt your engine, but the light oils and Naphtha based products may not do much good either. A product containing polyisbutylamine (PIBA) and polyetheramine (PEA) might perform better if you are going to add gas treatment to the tank.

Should you inject Seafoam or other top engine cleaners into a vacuum line?

In a vehicle with a MAF sensor, all inbound air is metered by the MAF usually mounted right after the air filter. As you remove a vacuum line on a MAF equipped engine, unmetered air enters. The PCM takes the unmetered air by way of the pre-cat oxygen sensor swiftly going lean.

The PCM immediately reacts by adding fuel. Now you inject Seafoam or Gumout Multi-Tune product into the intake vacuum line along with the added fuel.

Whether you’re cleaning the valve stems and interior of the intake is almost immaterial since you are simply dumping extra fuel and cleaning solvents into the catalytic converter (an incinerator that is designed to burn off excess fuel and oil). If the catalytic converter on your car is fixed in or right after the exhaust manifold, this injection method can cause your catalytic converter to overheat and self-destruct.


You can try another injection method. The ACDelco Upper Engine and Fuel Injector Cleaner product recommends injection by atomizing the product into the air intake duct, and not a vacuum line.

You’re not getting unmetered air past the MAF by doing this. You can buy the product in an aerosol can or buy an atomizer canister and load the liquid into it and pressure with compressed air. After this, you can spray the product into the air snorkel so it’s measured along with incoming air. As the product burns, the pre-cat oxygen sensor notices the richer mixture and the PCM cuts fuel trims.


The Sea Foam Motor Treatment is commonly used in auto repair shops and garages globally. Apart from it being inexpensive and versatile, you can use it on your gasoline or diesel engines. It is also suitable for cleaning tasks and fuel treatment since it helps with lubricating the engines and guarding them against wear and tear.

Sea Foam product isn’t effective at only one task due to its wide range of applications. Its gentle ingredients makes it safer than other industrial-strength cleaners. It’s an effective product for general maintenance and cleaning purposes.

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