Best Engine Sludge Remover: Reviews, Buying Guide and FAQs 2023

by Chris Lewis.

Every vehicle owner should realize the fact that it is quite essential to keep the insides of your engine clean and operational. But it sounds like a complicated task.

Well, it isn't, because sludge removers will do the job for you! In this article on the Best Engine Sludge Remover, we'll help you find the best flush for your engine to keep it healthy and always fully operational.

Because, after all, as we humans need our circulation to have no restrictions, engines require that freedom for longevity and functionality.

Editor's Recommendation: Top Engine Sludge Remover 2023

Image Name Ratings
Marvel Mystery Oil MM12R
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4.6 / 5.0
Liqui Moly 2037 Pro-Line Engine Flush
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4.8 / 5.0
Chevron Techron
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4.5 / 5.0

Top 8 Best Engine Sludge Remover Reviews 2023

When it comes to sludge removers, there are many choices; it can be hard to set your mind onto one of them, but this is where we come in; we'll help you find the right one.

 8 Best Engine Sludge Remover Review
8 Best Engine Sludge Remover Review

1. Sea Foam SF-16 Motor Treatment

Sea Foam SF-16 Motor Treatment
Sea Foam SF-16 Motor Treatment

Let's start with a product that has been around for a long time; it has been delivering one of the best engine maintenance performances. Sea Foam SF-16 has been around since 1942.

As overtime, the engine accumulates many carbon deposits and sludge; it's imperative to clean them up if you don't want them to clog the pathway and restrict some of the most basic functionalities.

This situation is where the Sea Foam motor treatment cleans the injectors, carb jets, and passage-ways. Why are these important? Well, there are several advantages, and it's not just about cleaning.

Sludge and several other waste deposits will degrade your vehicle's performance over time and cause your engine parts' wearing. These are harmful in many scenarios; also, they might even wholly render some features useless.

So, this fantastic product will clean that right out and help you manage your vehicle's health in the best way possible. Moreover, it is capable of clearing out fuel residue in fueling systems.

This product will break down the deposits and dissolve them so that they can be filtered out. Therefore, it will reach every corner of your engine and clear out anything that might restrict it.

Additionally, the product is pure petroleum so that it won't cause any corrosion from within the engine, and it will lubricate it with excellent efficiency for further functionality.


  • Hundred percent petroleum
  • Dissolves fuel residue
  • Lubricates actuators
  • Liquifies engine contaminants
  • Reaches every section of your engine


  • Sometimes causes startup issues
  • Might cause performance issues

2. Liqui Moly 2037 Pro-Line Engine Flush

Liqui Moly 2037 Pro-Line Engine Flush
Liqui Moly 2037 Pro-Line Engine Flush

This product is one of the most well-known engine flush systems known for its high functionality and proper engine maintenance. The effects of this engine flush are almost immediate when it comes to other products.

Liqui Moly is an easy-to-use product for everyone. It's relatively straightforward when it comes to usage. Moreover, it is fully compatible with several types of engines.

That's one of the best parts of this engine flush, as there are different types of flushes based on the type of vehicle you plan to use it on. But the ones that are fully compatible with both allow you to have more flexibility.

Moreover, the engine requires delicacy when cleaning the insides and clearing out sludge, the hunk from within the machine. This product perfectly provides this delicacy as it does not contain any harmful components.

This corrosion-free flush will allow your vehicle to be safe from bad reactions among the contaminants and the sludge remover. Also, it will enable the car to have better reactions that will increase the vehicle's performance.

Additionally, this product is also compatible with catalytic converters that transform all the contaminants from within the engine into safe byproducts like water.

The engine flush will work together with the catalytic converter to dissolve and allow the engine to minimize excess emissions and reduce oil consumption.


  • Well-matched with catalytic converter
  • Flexible usage
  • Compatible with both diesel and gasoline engines
  • Reduces fuel consumptions
  • Improves the health of your oil filter


  • Doesn't work well with older engines
  • Slow reactions

3. Chevron Techron

Chevron Techron
Chevron Techron

When you want your vehicle to perform in the best condition and have full functionality, no matter how long it has been in usage, this is where Chevron Techron comes in.

Your engine's deposits are one of the core reasons behind your vehicle not giving you enough performance or mileage. These gunk and sludges make the engine overwork, while the fuel consumption is high.

Therefore, the Chevron Techron is terrific at making your vehicle perform much better, and it will restore the lost power and performance caused by it. It will work in every corner and pipelines throughout the exhaust system.

This product reaches the fueling system and cleans the fuel injectors, valves, and pistons. These are also lubricated adequately with the product. Therefore the parts will not have any restrictions considering functionality.

The pistons and valves will work more efficiently due to the high lubrication. That will create more efficient combustion allowing the engine to work faster and not lose any performance.

It is essential to best engine flush cleaner every 3000 miles because gradual usage will cause the gunk and residue to build up in the passage-way, which blocks airflow and overheats the engine.

Therefore, this flush will dissolve those contaminants and make the vehicle perform better and more efficiently due to smooth airflow along with reduced heat.


  • Compatible with several vehicle types
  • Improved piston movement
  • High-quality lubrication
  • Increase airflow within the pipeline and valves
  • Removes carbon deposits and improves performance


  • Causes engine misfires
  • Doesn't reduce fuel consumption

4. Marvel Mystery Oil MM12R

Marvel Mystery Oil MM12R
Marvel Mystery Oil MM12R

One of the best engine sludge remover on this list is Marvel Mystery Oil; they have been around for a long time providing top-tier vehicle maintenance that hasn't lost its quality even after so long.

This item is one of the most affordable and effective flushes for your engine, and within minutes you will notice better and smoother performance. Therefore, it will lubricate and improve the movement of the actuators.

Moreover, one of the fantastic things about this product is its capability to reduce the sounds produced at startup and allow your car to operate more quietly. This function happens through the lubrication of the valves and pipeline.

Additionally, it will prevent varnish and gum build-up; these cause the pathway to be more restricted while the airflow is inefficient. These issues can cause overheating of the engine.

With time, the engine loses some of its flexibility, and due to continuous combustion, the pipeline and pistons may wear off quickly. The Marvel Mystery engine flush will work to restore the quality of the parts.

Gradually, all these advantages will work together to improve your vehicle's performance and fuel economy since this product will reduce unnecessary combustion.

Additionally, it will improve your oil filter's quality since there will be a lack of contaminants present in the engine and oil; it will make the oil filter last longer.


  • Improve fuel consumption
  • Prevents varnish and gum build-up
  • Increase the functionality of valves and pistons
  • Minimize excess emission
  • Increase the longevity of oil filters


  • Causes terrible smell in the exhaust
  • Reason for cold startups

5. Gunk FEB1 Foamy

Gunk FEB1 Foamy
Gunk FEB1 Foamy

When you're using best engine flush, one of your biggest concerns would be your engine's safety upon the usage of the product. This situation is where Gunk FEB1 offers the best protection and security.

This product is widely famous for its various advantages; people who love assurance and high-quality performance no matter the condition always lean towards Gunk sludge remover.

Moreover, this product is one of the most efficient and easy to use sludge remover that everyone loves. The simplicity of its usage makes it the right choice for people of all categories.

Due to its foamy composition, it makes the right choice for removing even the deepest of contaminants. It dissolves the oil components and removes any unwanted material from your engine pathways and surface that keeps your engine cool.

As we all know, it is vital for the engine not to overheat since that will cause the engine to lose its integrity. This product will help you keep your engine healthy and last longer while looking better.

Also, it requires no scrubbing or brushing to be fully effective, you need to let it sit for 10 to 15 minutes, and it will remove any sludge, oil stain, or blockage without any issues at all.

You will see noteworthy results that will make you love the simplicity and efficiency of this fantastic product. Additionally, it has a spray-on function that won't require any extra work.


  • Easy spray-on function
  • Foam helps remove stronger grime and grease
  • Compatible with engine parts
  • Easy to wash off
  • Non-corrosive composition


  • Takes time to take effect
  • Can't reach corners

6. STP High Mileage Engine Flush Formula

STP High Mileage Engine Flush Formula
STP High Mileage Engine Flush Formula

STP high mileage is one of the most highly reviewed products in the market. It's famous for many reasons, one of them being its capability to increase mileage up to a significant amount.

Also, this product has many interesting facts, such as its revolutionary composition that allows you to efficiently clean your engine's depths. This product can remove the hardest of stains without any restrictions.

Moreover, this product is designed to improve vehicles' mileage for over 75000 miles, as it will enhance greater oil flow and allow the engine to burn only the necessary amount of fuel.

This product can prevent oil wastage at greater efficiency by improving the airflow and removing any clog on engine components. It can improve that feature and build upon it.

Additionally, the cleaning agents are highly concentrated, which allows the agents to remove the hardest of sludge and any other waste deposits due to combustion. It will break down the stain components and will enable them to pass through the ventilation.

On top of removing such components, this product can prevent it from happening again, keeping the pathway lubricated and actively working to increase performance.

Whenever you make an oil change, you can use this product to keep the insides clean and operational, preserving the oil filter's quality.


  • Substantially improves mileage
  • Engineered for every engine component
  • Will improve help the oil filters last longer
  • Reduces sludge and engine deposits
  • Compatible with several types of engines


  • Causes corrosion on the seals
  • Causes leaks and cold starts

7. Auto-RX Plus is an All-Natural Metal Cleaner

Auto-RX Plus is an All-Natural Metal Cleaner
Auto-RX Plus is an All-Natural Metal Cleaner

This best engine sludge remover is one for the customers that love naturally composed engine flush. And this product contains all the right components that will improve your vehicle's aspects, so you should keep an eye out for this one.

Auto-RX plus has been around for a long time and has provided a service for vehicle owners that is noteworthy. This patented metal cleaner is all-natural and works deep in your engines.

Moreover, it will efficiently reach every corner of your engine so that you can keep your machine safe from unnecessary deposits and sludge. It will clean the valves and work correctly with the seals without causing erosion.

Most vehicle owners fear the bad reactions engine flushes may have; therefore, this product is always a go-to choice since it ensures safety. Its all-natural composition doesn't have any disruptive reactions.

Moreover, this metal cleaner is entirely compatible with engine oil, whether synthetic or conventional. It will not react with those and work entirely independently.

Instead, it will create a much more suitable environment within the engine to allow the engine oil to work more efficiently and substantially improve performance.

Additionally, this is a highly efficient metal cleaner that will improve your pistons' condition and allow greater clearance for the valves, which will reduce the oil drain.


  • All-natural composition
  • Quickly spreads within the engine
  • Doesn't have reactions with components
  • Compatible with engine oil of any kind
  • Improves piston mobility


  • Requires two bottles to remove sludge
  • Doesn't work well with transmission fuel additives

8. Lubegard 95030 Engine Flush

Lubegard 95030 Engine Flush
Lubegard 95030 Engine Flush

When you want to get your vehicle prepared for an oil change and engine oil, Lubegard is the product you need to go with. This product works to drain out all the contaminants to make it ready for maintenance.

We know that waste of more than 20 microns causes the engine components to wear quickly and damages the engine that requires a lot of money to fix.

This situation is where the product comes in; this premium synthetic blend allows you to get all the components to flush out to create a better environment around the engine to improve the performance.

It will also improve the pipeline and components' situation to react well with the oil change, giving you the performance you require.

Moreover, this product is fully compatible with all the engine components that will not cause any harmful reaction or corrosion within the engine. This product will also remove accumulated sludge and other parts.

Due to combustion, slow the engine waste accumulates in the pathways and valves, making the engine overheat, which is quite degrading for the engine's health.

This product will allow you to safely remove those and flush them out within 5 to 10 minutes to enable you more flexibility and efficiency.


  • Minimizes friction
  • Lubricates engine components
  • High-quality synthetic composition
  • Reduces engine temperature
  • Removes tar, varnish, and sludge with only a single-use


  • Does not react well with engine oil
  • Takes time to have a proper effect

What Is an Engine Flush and Why Do You Need to Remove It ?

Did you know that an engine flush is one of the most common reasons for why cars break down on the side of the road?

An engine flush is a combination of solvents and water that are mixed together to clean out impurities in your car's oil. It usually contains things like kerosene, methanol, and other solvents.

Engine flush is typically used when a new engine is being built, but it can also be used with used engines that have been installed in a car for the first time. Since an engine flush often includes methanol or other strong chemicals, you should never add it directly to your car's oil system.

When you add too much engine flush solvent to your car's oil system, the buildup in your motor can cause it to become very loud. Once this happens, you will need to get an engine flushing job done immediately before your car breaks down on the side of the road.

If you recently had an engine installed in your car, it is best to have an engine flush done before driving the car for the first time. This will ensure that all of the excess oil and other chemicals are removed from your car's new motor.

Even though an engine flush may seem like a good idea when you get an engine installed in your vehicle, you should never flush your car's engine when you are planning to sell it. This will remove the protective oils around the motor and can seriously affect its value and resale potential.

If your engine is not running well and you think that an engine flush will help fix your problem, you may want to talk with a mechanic or automotive expert first before trying it.

If you are planning on getting an engine flush done to help your car's current issues, you should be aware that not all vehicle fluids can withstand high concentrations of cleaning solvents. This means that if your oil is not compatible with the chemicals in the engine flush, it could damage your new or used motor.

How to Identify if Your Car Needs an Engine Flush

Even though engines are really simple, they still get dirty. Unburned fuel and oily deposits build up over time. Oil can't be reused; it gets old quickly, so you need to change it every 3,000 miles (or less). The oil is supposed to keep the moving parts of your engine clean by bathing them in a protective layer of lubrication. Unfortunately, accumulated gunk builds up inside the engine-especially in the upper part where oil flows-and that decreases its ability to do its job properly.

Eventually, all this dirt has an impact on performance and efficiency. If you notice some signs of trouble like reduced gas mileage or rough idling, it be time for an engine flush. As the name implies, engine flushes are nothing more than the complete replacement of old engine oil with new oil. Replacing used up oil with fresh stuff is called an "oil change," so what do you call replacing dirty old oil with new stuff? An engine flush! You may have seen commercials where mechanics claim that this simple process cleans out all the gunk inside your car's engine and ensures years of trouble-free driving.

It sounds too good to be true, right? If it feels like a scam, well...that would be because it IS one. There is some truth in advertising here because there will probably be less dirt after an engine flush (at least initially), but their claims of long term benefits are mainly based on marketing mumbo jumbo. So if you're wondering, "Do I need to get an engine flush?", just keep on reading.

As you can probably guess, engines can get very dirty over time. Naturally, this is the case with any kind of machine that moves around a lot. The engine gets hot and all the moving parts are tumbling at high speed, so some of the oil is burned away. Since it can't be reused, it needs to be replaced by new oil. But here's where things go downhill...

Old engine oil contains some contaminants that aren't always burnt up during normal driving. As a result, this oil gets really dirty and can start to gum up the engine. That's why it gets replaced every few thousand miles (or less), especially in newer cars that are designed with better filtration systems.

Engine flushes are still around, but they aren't very common these days. This is mainly because most modern cars use fuel injection instead of the carburetor/throttle body system-a big part of which is a fuel injector cleaning process called "fuel washing." Fuel injection relies on computer controls and it's also cleaner than its predecessor. Modern cars are already designed to clean themselves by having sensors that tell the engine when it needs to do maintenance, like an oil change or fuel injection cleaning. Those sensors automatically run the engine at operating temperatures, which is what's needed for fuel washing (and to keep everything clean).

The Best Way to Remove an Engine Flush From Your Car

To remove the engine flush from your car, you will need to drain out as much of it as possible and then replace it with a fully compatible motor oil. If you do not change the engine flush for new motor oil, there is a good chance that your car's engine will seize up on you during or after your trip.

Engine flushes are used to clean out an engine that has been contaminated by buildup from a previous lack of maintenance. Used engine flushes should never be put into a vehicle because it can cause damage to a car's components and make a vehicle fail state inspection.

An engine flush is a solvent-type product designed to remove all kinds of engine contamination. Typically, the flush is used in place of an oil change for maximum effectiveness when dealing with internal combustion engines that have not been serviced correctly or at all.

Over time, an internal combustion engine can become coated in deposits from gasoline and diesel fuel that are left behind during operation. If these deposits remain, they will eventually harden and cause severe damage to an engine.

Engine flushes are designed to remove most of these deposits, but they are not effective at removing certain types of deposits such as those caused by coolant leaks or oil leaks. Engine flushes are most commonly used in place of oil changes when it is time for an internal combustion engine's regular service interval to be met.

You should avoid putting old engine flush into a car because it can cause extensive damage to your vehicle.

Buying Guide for the Best Engine Flush Remover

You need to keep in mind several things before buying a sludge remover, as each product works differently, but the features you need to look for are more generalized.


Each sludge remover uses different compositions to ensure their effectiveness; some go with more natural materials while others focus on more reactive synthesized composition.

That's why it's essential to know which is better, but we'd suggest going with something more naturally constructed as those are safer when it comes to reacting with engine oil.

But the downside of that is their reaction time; they take longer to take effect; this is where synthesized engine flush works better. These products spread through every component of your vehicle and work faster.

In the end, it all comes down to your preference in case of reactiveness. Do you want something with better safety but a slow reaction time or with something that works faster?


This fact is crucial if you own multiple vehicles of different categories or work with varying types of cars. You always need a product that works well with different kinds of fuel.

Some engine flushes are for gasoline engines; they can clean the insides of your and cause it to perform better while having improved mileage.

Some diesel engines are more powerful and capable of reacting with a high amount of gunk and sludge within the machine, breaking them down to be flushed out.

But we would recommend going with a sludge cleaner that is compatible with both as those work better with any situation, as sometimes you might need a highly reactive type that will remove deeper contaminants.


Undoubtedly this feature is significant for any product, as you need to know how efficient this product is as you're spending a substantial amount of money on it.

Engine flush needs to be capable of clearing the wastage formed by the engine with every user to get the effect you are looking for. It will help you get the value of the money that you spent on the product.

The product should efficiently go deeper into the engine and formulate a better reaction that will allow it to break down any sludge deposit and grease.

Some product requires some idle time before being flushed out, so keep an eye out for that vital product.

Will Engine Flush Damage Engine?

Most Engine flushes avoid damaging your vehicle in any way and protect the components inside your car. Still, they are fully capable of damaging your seals and other parts that might require expensive repairs.

You don't essentially need best internal engine cleaner to keep your engine at top conditions, as you can do it without adding any additional components inside the machine.

There is a high possibility that they might react badly with the engine oil and sometimes even cause corrosion. Some people experienced such a phenomenon where the engine flush causes decay within the pipeline.

Moreover, the flush's chemical additives can damage the seals, and eventually, it may lead to leaks that are expensive to repair. These products also may lead to a rough startup and a bad smell.

So, it is not fully out of the possibility that engine flushes can damage the engine's components and cause corrosion and leaks that are not easily repairable.

This product can also damage bearing and react badly with metal components and engine oil causing permanent damage and sometimes even worse things.

Therefore, natural composition flush is preferable as those have a much safer reaction and might not even harm your vehicle, but it still risks damaging your engine.

FAQs about Engine Flush Removers

1. Will engine flush cause corrosion within my engine?

Some are known to have that kind of reaction with other engine parts, so it's imperative to see if the product you want has that kind of record where it caused any bad reaction.

2. Will sludge removers get rid of grease?

Yes, every sludge remover is fully capable of removing grease from your engine, even varnish, and tar that formulate due to combustion within the machine. So, you get all those advantages altogether.

3. Are engine flush compatible with multiple types of vehicles, or they specialize?

They have various flushes that are compatible with only a specific type of gasoline or diesel engine. But there is also a type that is compatible with both; therefore, you can buy those for more flexibility.

4. Do I need to keep my engine on while using them?

After using an engine flush, you need to keep the vehicle idle and on for about 5 to 10 minutes; some products may even need more time.

5. Should we use them before or after an oil change?

You can use both before or after, as each product has different requirements, therefore look it up before using.

Final Words for Engine-Flush Remover Buyers

Engine flushes are not all bad. When employed properly, the process can actually remove harmful, burned out deposits from your engine's cylinders and make way for cleaner oil flow. The problem is that the vast majority of garages allow their mechanics to use brash techniques that can end up doing more harm than good - or even damage your engine altogether.

Sludge remover can be tough to choose a product out in the market as it deals with a sensitive vehicle component. This article on the Best engine Sludge Remover will help you find the right one.

Buy them at Etsy, Walmart, eBay (subject to availability)

Sea Foam SF-16 Motor Treatment - 16 oz. - Walmart, Etsy, eBay

STP Fuel System Cleaner and Stabilizer, Ultra 5-in-1, Advanced Synthetic Technology, 12 - Walmart, Etsy, eBay

STP High Mileage Engine Flush Formula, Oil Cleaning for Cars & Truck, Bottles, 15 Fl Oz, - Walmart, Etsy, eBay

RESURS Total 50 g Top Quality Petrol Engine/Diesel Engine/LPG Engine/Car Engine Restorer - Walmart, Etsy, eBay

XADO Engine Oil System Cleaner with Anti-Carbon Effect - Removes Contamination & Engine - Walmart, Etsy, eBay

About Chris Lewis.

Chris Lewis is a passionate individual with a deep affinity for the world of automobiles. From a tender age, his fascination with cars was nurtured by his father, a seasoned mechanic based in the vibrant city of San Francisco. Growing up under the watchful guidance of his skilled father, Chris developed an early aptitude for all things automotive.

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