Cleaning & Detailing

Best Internal Engine Cleaner (Review & Buying Guide) in 2022

12 Mins read

Liqui Moly 2037 Pro-Line Engine Flush

Prolong Super Lubricants Engine Flush

Niteo Motor Medic Synthetic Engine Flush

Best Internal Engine Cleaner
Liqui Moly 2037 Pro-Line Engine Flush
Niteo Motor Flush
Lubegard Engine Oil Flush
Prolong Super Lubricants Engine Flush
Niteo Motor Synthetic Flush
Lubegard Engine Flush
Sea Foam Motor Flush
Ravenol Professional Engine Flush Cleaner
XADO Engine Oil System Cleaner

Are you tensed about the engine of your vehicle? Is there any drop in its performance than that when it was in new condition? Maybe that’s true, I guess. The engine is comparable to the heart of your body. Whatever it is a car, bike, or truck, the engine keeps the vehicle running. 

Just as your heart can’t function properly when the arteries get blocked, your car engine may suffer the same problem too. Engines get clogged up over time with dirt and deposits. The age-old sludges and buildups block the oil passage and let less oil to pass through. It wears the engine and reduces the performance as well as causing some other problems. You might have noticed this issue with your car, and that’s why looking for a solution. 

So what’s the solution to this problem? The answer is cleaning the engine often. Now it comes to your mind how to clean a car engine. Right? Well, you can go to a car maintenance shop and ask them to clean the internal engine. They’ll dismantle the engine, remove the dirt from inside, and reassemble it. It seems quite a hassle, right? Luckily there’s another way out. Yes, that is using an internal engine cleaner or engine flush. 

Best Internal Engine Cleaner

Engine flushes are designed to dissolve and remove the buildup and sludge inside your engine, taking it back to new condition again. These products are effective to clean the engine quickly, and it enhances the overall performance of your engine. So, an internal engine cleaner can be a wise pick to clean your engine regularly and keep it in a tiptop condition. 

Now the problem is finding the best internal engine cleaner since there are plenty of these products in the market. So, in this article, we’re going to walk you through the best engine flushes we’ve tried out so far. This will be a complete buying guide for you to choose the best product that meets your demands. Now let’s dive deeper.

# Liqui Moly 2037 Pro-Line Engine Flush


Do you want an engine cleaner that you can use in any kind of engine? Then Liqui Moly 2037 Pro-Line is the best internal engine cleaner for you. This professional-grade engine sludge remover easily removes the dirt, gums, varnishes that create buildups inside the engine, and clogs the oil passage. This engine flush has its reputation for reducing engine temperature during driving. Also, specialized additives prevent corrosion. 

This engine flush is easy to use. All you require is to pour the cleaner into your engine and keep it idle for 15 minutes. After that, drain out the oil and replace it with new motor oil. The quick action of Liqui Moly 2037 Pro-Line engine flush lets your engine get rid of all the dirt and deposits, and give you a smoother drive. 

The only drawback we found is it doesn’t cut your oil consumption. However, that’s not the sole purpose of an engine cleaner. This product does its primary duty finely. So, you can’t look beyond it when you want the best internal engine cleaner for your car.

Product Specification
Brand: Liqui Moly
Model: 2037
Item Weight: 1.05 pounds
  • Usable on both diesel and gas engines
  • It reduces engine temperature
  • Quick action
  • Doesn’t reduce oil consumption

# Niteo Motor Flush

Let’s start from there where we finished the last product. Yes, if you want an engine flush that will reduce your oil consumption along with cleaning the interior of the engine, then Niteo Motor Medic will be the best engine flush for you. You can use it before every oil change. This engine cleaner works within 5 minutes and the strong detergent flushing breaks apart any sludge, dirt, and contaminants. So, with every flush, you restore the lost power and performance of your engine.

Moreover, it makes the engine more efficient and reduces oil consumption which you’ll observe in your monthly expenses. There a question may arise in your mind if the product causes wear to the engine as it is very active. No worries, in our use, we found that this engine flush doesn’t damage the seal and wear the engine. But you have to make sure you use the cleaner as it’s instructed.

Product Specification
Brand: Niteo
Model: MF3-12PK
Item Weight: 25 pounds
  • Works within 5 minutes
  • Reduce oil consumption
  • Doesn’t damage the seal
  • You may not like the smell.
  • Some users complain it doesn’t work well on hardened sludge.

# Lubegard Engine Oil Flush


What things come to your mind when thinking of having a new car? I bet fuel efficiency is one of them. But, the fuel efficiency or fuel economy whatever you name it, gets disappeared as the engine gets older. What if you could find something that restores the fuel economy and cut your cost? Lifeguard engine oil flush exactly does the job, and that’s why it’s in our list of the best internal engine cleaners. 

This engine flush reduces the friction and engine temperature and extends your engine oil life up to 30%. So you don’t need to change the oil often and thus, save your money. This product comes with Liquid Wax Ester (LXE) technology which prevents corrosion and engine wear and protects the lubricity of the engine oil. 

Apart from this, we found it reduces the noise while starting the engine and gives you a smoother driving experience, especially in cold weather. This cleaner is popular among car enthusiasts for its ability to optimize engine performance in both diesel and gasoline engines. So, you can keep it in your wishlist for the next purchase.

Product Specification
Brand: Lubegard
Model: 40902
Item Weight: 2.3 pounds
  • Improves fuel efficiency
  • Cut your fuel cost
  • Prevents friction and wear
  • Reduces noise on starting
  • Not suitable for some high mileage engines

# Prolong Super Lubricants Engine Flush


The thing that made this engine flush to cease a place in the list of best internal engine cleaners is the specialized anti-friction metal treatment technology. The product keeps its name by extending the engine life. 

Apart from cleaning and the interior, this cleaner creates a bond with the metal surface and leaves a protective layer. This layer reduces the damaging friction and excessive heating which is very important not only for performance but also for engine life. Also, this cleaner is usable in both gas and diesel engines. However, we recommend not to use it on your brand new engine.  

Product Specification
Brand: Prolong Super Lubricants
Item Weight: 1.1 pounds
  • Anti-friction formula
  • Reduces engine temperature
  • Extended engine life.
  • Can’t be used in brand new engines.

# Niteo Motor Synthetic Flush

Here comes another engine flush from Niteo. This cleaner is perfect for diesel and turbocharged engines. However, you can also use it in a gasoline engine. Use this before changing the engine oil every time. This automotive engine sludge cleaner flushes out dirt, varnish, gum, and any stubborn buildup inside the engine. Besides, it increases the lubricity and releases sticky valves and pistons, making the oil circulation through every part easier. Moreover, you can use it comfortably with both conventional and synthetic oil. 

Just like the previous engine flush from Niteo, this also takes only 5 minutes to clean the engine. So, you need to be conscious while using it as you can’t keep it inside for longer than 5 minutes. 

However, due to its versatility and extra strong cleaning power, it’s a strong candidate among the best internal engine cleaners.

Product Specification
Brand: Niteo
Model: MFD1
Item Weight: 2 pounds
  • Works within 5 minutes
  • Improves oil circulation’
  • Can be used in all gasoline and diesel engines
  • Can leakage the seal if not used properly

# Lubegard Engine Flush

Here comes another versatile engine flush from Lubegard which you can use on all kinds of diesel and gas engines. Lubegard engine flush contains a premium blend of detergents and dispersants that removes the last particle of contaminants from your engine with its extra-strong cleaning power. Also, this product doesn’t contain any chemicals that would cause harm to the seal and internal surface. And All these benefits come with a cost that fits your pocket. This made this product one of the best internal engine cleaners. 

Product Specification
Brand: Lubegard
Model: 95030
Item Weight: 15 ounces
  • Versatile engine cleaner.
  • Causes no harm to the seal and gaskets.
  • Easy to use.
  • The smell can be irritating for some people.

# Sea Foam Motor Flush


Sea Foam Motor Flush has earned its reputation among car professionals and DIY experts over the years. It because of its more targeted approach to clean the engine while other motor flushes take a generalized approach. This engine flush cleans the fuel injectors and carburetors passageways. Also, it takes care of the valves and pistons. The quick action of Sea Foam makes your engine free from the sludge and dirt, and it is usable on both diesel and gasoline engines.

Product Specification
Brand: Sea Foam
Model: SF-16
Item Weight: 1 pound
  • Targeted approach.
  • Can be used in both diesel and gas engines
  • Quick action.
  • You may find difficulties in opening the bottle.

# Ravenol Professional Engine Flush Cleaner

 Ravenol-Professional-Engine Flush-Cleaner

Ravenol engine flush has its reputation for cleaning and rinsing out the entire engine system. This product effectively breaks down sludges and removes them from the engine, giving it a fresh start. This engine cleaner is equally effective on both diesel and gasoline engines. Moreover, it prevents dirt build-ups inside the engine and keeps the engine clean for a longer time. Also, it’s easier to apply than you think.

Product Specification
Item Weight: 15.2 ounces
  • Long-lasting effect.
  • Compatible with both diesel and gasoline engines.
  • Trusted product.
  • Costlier than other products of its type.

# XADO Engine Oil System Cleaner


Our last pick in the list of the best internal engine cleaners is XADO Engine Oil System Cleaner. This cleaner is equipped with anti-carbon properties which made it highly effective to clean your engine as most of the deposits and build-ups are mainly carbon. However, this doesn’t mean that it won’t work against other types of contaminants. This engine flush helps your engine get rid of any kind of sludge and dirt. Also, it cleans the crankcase ventilation system and takes the engine back to technical purity. So you can try it out without hesitation.

Product Specification
Item Weight: 15.2 ounces
  • Long-lasting effect.
  • Compatible with both diesel and gasoline engines.
  • Trusted product.
  • Costlier than other products of its type.

Best Internal Engine Cleaner & FAQ

After finishing the reviews, you’re now well informed to choose the best internal engine cleaner for your car. However, buying the best engine flush can’t give you the best result alone. You have to use it properly. So, you need to know some extra things apart from knowing the best engine cleaner. In this section, we’re going to cover those things that would help you in buying and using an engine flush properly. 


Why You Should Use Engine Flushes

Before using a product, you should have a clear idea about why you should use it. So, let’s talk about the benefits of using engine flushes that make its use worthy and value for money. 

  • Prepare the Engine for Fresh Oil

Changing the engine oil regularly is a good practice to maintain the good health of your engine. However, with every change of the engine oil, dirt and deposits pile up inside the engine. It causes clogging and reduces the performance of the engine. So, the fresh oil can’t perform well as it should. Engine flushes remove the dirt and contaminants and prepare the engine for fresh oil so that it can show its optimum performance.

  • Clean Hard to Access Parts of the Engine

Cleaning the engine isn’t an easy task without dismantling it. But it’s not possible always. An engine flush helps you in this regard. It can clean every corner inside the engine without tearing it into pieces. 

  • Improve Fuel Efficiency

Another significant benefit of an engine flush is that it improves fuel efficiency. Some engine flushes reduce the friction and temperature in a running engine. Thus they enhance the engine oil life, and you don’t need to change it often. Besides, they improve oil circulation by cleaning the oil passages. So, the clean engine makes efficient use of the fuel and cuts your cost.

  • Reduce Emissions

Since cleaning the engine removes sludges and cleans the ways for oil circulation, it reduces oil consumption. And, lower oil consumption means lower emission. Thus, engine flushes can help you reduce carbon footprints and cause less harm to the environment. 

Types of Engine Flushes

Mainly there are three types of engine flushes available in the market. These are:

  • Diesel Engine Flush

These products are developed for vehicles that are powered by diesel engines. A diesel engine flush typically breaks down the dirt, sludge, and deposits, and flushes out the contaminants from the engine.

  • Gasoline Engine Flush

This type of engine flush works on gasoline engines. They are formulated typically for use in higher mileage engines. They do the same task as diesel engine flushes. 

  • Gasoline and Diesel Engine Flush

Apart from the above two, there’s another product which is a combination of gasoline and diesel engine flush, and can be used on both types of engines. These engine flushes are convenient for general use for their versatility.

Features to Consider When Buying an Engine Flush

Have you thought about the features of the best internal engine cleaner while going through the review section? Yes, those features which made the products superior to others. Though there are a lot of factors to consider when buying an engine flush, some are essential and need extra attention. Now let’s talk about those features. 

  • Additives

Engine flushes are nothing but a mixture of different additives. They have different roles to play. And you need to find out what combination works the best in your car. Usually, every engine flush contains detergent agents that remove the sludge and dirt. Also, the dispersants tear down the solidified deposits to dissolve them in detergents. Apart from these two, engine flushes also contain anti-wear and anti-corrosion additives to protect the internal surface from friction and extend the engine life. 

  • Compatibility

One of the essential things to consider when buying an engine flush is its compatibility. We have discussed different types of engine flush for different engines. So you should check whether the engine flush is compatible with your engine type or not. Though most of the modern engine flushes work on all kinds of diesel and gasoline engines, there’s a question of compatibility with the engine oil too. Since you’ll need to mix the oil and engine flush sometimes, so you have to make sure the flush is compatible with your engine oil. 

  • Time requirements

Different engine cleaners take different time duration to dissolve the contaminants and flush them out of the engine. Some may finish it within 5 minutes while some may take 15 minutes or even longer. However, you must stick to the instructed time and never leave the engine flush longer than that time. Otherwise, it will cause specific damage to the engine as engine flushes contain active chemicals. 

  • Price point

The real game-changer of buying the best internal engine cleaner is the price of a product. Sometimes you need to sacrifice your best choice for its price exceeding your budget. However, it’s not unusual that good products come with a high price tag. Yet, if you’re on a tight budget, you should consider the price as well as the average number of uses that you can avail from a bottle. Besides, you can go for bulk purchases as it cuts the average cost of a bottle. 

  • Safety and Ease of Use

Though engine flushes are supposed to clean the engine and enhance the performance, some engine flushes have their bad reputation for causing unnecessary wear to the engine. It happens for the active chemicals of the engine flush. So, you should find an engine flush that ensures preventing wear and damage. 

Furthermore, you should consider the ease of use. You’ll be using the engine flush on your own. So, find a product that is easy to use and doesn’t require any sophisticated tool and mechanical knowledge to apply it. Luckily we have enlisted the best engine flushes that you can use easily without any hassle. 

  • Efficiency

Just like any other automotive product, efficiency is an essential factor to consider when buying an engine flush. You should check how efficiently a cleaner cleanses the engine. Besides, what additional benefits it offers is also an important matter. Some products offer anti-friction, anti-wear properties, enhanced engine oil life, etc. You should rest your eyes upon those too. 

Tips for Using Engine Flush


Before approaching an engine flush, determine that your engine needs a flush by identifying the signs and symptoms which can be reduced performance, noise, etc. After that, find the best internal engine cleaner from a reputed brand that you can rely on. Today’s modern engine cleaners are designed to use on a DIY basis. You’ll find the detailed instructions on the bottle. Follow the instructions and flush your engine. However, if you aren’t confident enough to do the job on your own, please consult a professional. 

Best Engine Flush FAQ

Q: What is an engine flush? 

A: An engine flush is a mixture of chemicals that is formulated to work on the most stubborn sludge, break it down, and flush it out from the engine. It removes the dirt and contaminants from the engine and boosts up performance. 

Q: How do I know I need an engine flush?

A: You can know this by checking the signs and symptoms in your vehicle. These signs are reduced engine performance, increased fuel consumption than usual, reduced engine oil life, excessive noise during running, etc. 

Q: Is it safe to use an engine flush? 

A: Engine flushes are safe to use as they’re specially formulated to work on the engine, clean it out, and restore its performance. However, it is safe to use as long as you’re using it properly. 

Q: Can I flush engine oil by myself?

A: Yes, you can. Modern engine flushes are easy to use and don’t need to have a high level of mechanical knowledge. 

Q: How long does it take to flush my engine without a machine?

A: It depends on the product you’ve taken. Most of the modern engine flushes take 5 to 15 minutes.

Q: How often should I flush my engine? 

A: There’s no particular timeframe for this. However, experts suggest flushing your engine before every time you change the engine oil. Besides, you can do it whenever you notice a performance drop between two engine oil changes. 


Now it’s time to conclude the write-up. Throughout the article, we’ve tried to figure out the best internal engine cleaner for your vehicle and the things that you should keep in mind when buying an engine flush. We hope that it will help you to make your choice. 

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