5 Best Engine Flushes of 2021

Jerry Wilson
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Most people think that engine cleans are only used to remove deposits from engine parts like fuel injectors, intake valves, piston tops, spark plugs, and more.

And that’s all true. But engine cleans do more than just clean your engine. They can also control the exhaust emissions in your car and also cut engine noise! So essentially, an engine clean is a small but valuable investment in the quality of your engine!

We’ve put together a list of the best engine flushes of 2021 you can use to keep your engine in optimal condition.

NameCategoryProduct
CRC SX128 Salt Terminator Engine FlushBest OverallCRC SX128 Salt Terminator Engine Flush
Prolong Super Lubricants PSL11000 Engine TreatmentBudget PickProlong Super Lubricants PSL11000 Engine Treatment
Liqui Moly 2037 Pro-Line Engine FlushUpgrade PickLiqui Moly 2037 Pro-Line Engine Flush

1. CRC SX128 Salt Terminator Engine Flush

Our rating: 9 / 10

CRC SX128 Salt Terminator Engine Flush

Check Price on Amazon

Pros:

  • Effective cleaning product
  • Easy to use instructions on the label
  • Good value for money

Engines can collect a variety of contaminants which can interfere with the combustion process while also accelerating rust, causing sludge and fouling many fuel delivery components and metal surfaces.

The engine should be thoroughly cleaned and serviced prior to storage, otherwise corrosion can form on critical engine components.

This engine flush is a very effective cleaning product. It removes sludge, sediments, rust, varnish, deposits, gum, grease, carbon, and other contaminants in your engine.

2. Prolong Super Lubricants PSL11000 Engine Treatment

Our rating: 9 / 10

Prolong Super Lubricants PSL11000 Engine Treatment

Check Price on Amazon

Pros:

  • Highly concentrated, 1 to 4 ratio
  • Small engine care and protection
  • Fuel efficient
  • Protects against rust and corrosion
  • Prevents engine freeze ups

Cons:

  • Most lubricating oil products will reduce gas mileage
  • Could cause premature motor failure in some cases
  • Not recommended for all engines, check with manufacturers first

Why would you want to use an engine lubricating treatment of all things? Well, preventing engine freeze-ups is one benefit. This means you shouldn’t have to worry about your vehicle stalling on the highway due to a gaseous buildup in your engine. Another good thing about a PSL 11000 engine treatment is that it can help contain rust and corrosion.

This engine flush is highly concentrated and can be mixed with up to 4 quarts of motor oil or gas. It will help lubricate your engine and prevent build-up. It can also help increase your car’s fuel efficiency. The PSL11000 is also super smooth and won’t cause stalling. Plus, it can help your engine perform at its fullest potential and run better than ever.

3. Liqui Moly 2037 Pro-Line Engine Flush

Our rating: 9 / 10

Liqui Moly 2037 Pro-Line Engine Flush

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Pros:

  • Affordable
  • Breaks down build-up for easier cleaning

Cons:

  • Can gum up in cold temperatures
  • Doesn’t smell good

Another all-around great product is Liqui Moly’s Pro-Line Engine Flush. It’s in the entry-level price range and does a great job of breaking down cleaning organics and deposits from the engine. It’s easy to use and really gets the engine clean all around.

This engine flush comes in an easy-to-use bottle that allows you to control the dosage that you apply to the engine. It is specifically designed for use in all kinds of cars and trucks, eliminating engine deposits and dissolving carbon buildup.

This blend of cleaners, conditioners, and detergents breaks down build up for easier cleaning and maintained performance. The pro-line engine flushes quickly penetrates the engine compartment and removes all stubborn oil and sludge build up, cleanses the engine with effective surfactants and lubricant, and revives the entire engine to restore performance.

4. XADO Engine Oil System Cleaner

Our rating: 8 / 10

XADO Engine Oil System Cleaner

Check Price on Amazon

Pros:

  • Easy to use and highly effective
  • Quick and comprehensive engine cleaning
  • One bottle can be used for 2-3 engines
  • Prevents over 300 $ in repairs
  • Prevents sludge and gum
  • Completely biodegradable
  • Recommended by leading mechanics and mechanics alike
  • Heavy duty material
  • Works on gas and diesel engines

Cons:

  • The product is made in China
  • Availability is low

Detailed Review:

The XADO engine oil system cleaner is a serious powerhouse that’s a one-time buy and lasts an engine lifetime.

With a fantastic, easy to use design and a disinfecting formula, the XADO engine system cleaner is the best at cleaning an engine that isn't used regularly and needs to be revitalized.

5. Niteo Motor Medic MF2 High Mileage 5-Minute Motor Flush

Our rating: 5 / 10

Niteo Motor Medic MF2 High Mileage 5-Minute Motor Flush

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Pros:

  • Specially formulated for older engines
  • Cheap
  • All natural ingredients

Cons:

  • The pump didn’t work as described
  • Contains sand

The Niteo Motor Medic MF2 High Mileage 5-Minute Motor Flush is an easy solution for engines that are on their last legs. The Niteo Motor Medic MF2 uses the power of natural ingredients and enzymes to get rid of harmful build-up and restore your engines power so it is running like new again. The Niteo Motor Medic MF2 is great for older vehicles that are past their prime and could use some help getting around, so to speak.

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Frequently Asked Questions (FAQ)

What is the best motor flush?

In our opinion, the best motor flush will either be:

  • Simple Green or
  • Sea Foam

They come in either spray cans or in a bottle. They are both simple to use and both sold at most auto parts stores.

You might find it interesting to know that vehicles that are regularly maintained tend to not have to worry about motor flushes. You can use both of the above mentioned products to maintain your engine just once a month or 1,000 miles either while your car is still running or before it.

Your salesperson at the auto parts store or your mechanic will still recommend the flushes for the best results, but if you live in a city where a car or truck never sees dirt, this is one flushing you can skip.

Do engine flushes really work?

If you take care of your vehicle, then an engine flush may not be necessary. However, if you live in an area where the air is heavily polluted or pile up heavy road dust, then you may want to consider to flush your vehicle’s engine. It will remove the byproducts of internal engine wear and help to keep the internal engine parts cleaner longer. It is not a panacea for mismanagement but is arguably a useful component to a preventive maintenance program.

Why do I need a flush?

Engine flushes and oil changes both serve the same purpose: remove old worn out sludge from the internal parts of the engine. The main difference is that oil changes get rid of oil deposits, and engine flushes get rid of more problematic sludge.

In addition to cleaning the engine parts, flushing the engine also reduces the potential for radiator damage and the build up of harmful sludge to damage the oil pump or engine block.

Will engine flush damage engine?

Actually, it is not bad for your drive train if you use the flush according to the package instructions. The possibility of harming your car's engine can be avoided by using a formula that is compatible with your vehicle.

You can read engine flush reviews online to determine if a particular product is safe for your vehicle. In most cases, engine flush kits are made using ingredients that are effective in removing corrosive elements from the engine.

Will an engine flush improve gas mileage?

Do you have the sneaking suspicion that your vehicle isn’t getting the fuel efficiency that it used to? If so, you may be right. For many cars, the fuel system can begin to clog and get heavy, causing the engine to use more gas in an attempt to push the thick liquid. You might even notice your engine using more gas for the same amount of miles driven as it once did.

Conclusion

More and more people are coming to accept the importance of an engine flush. In fact, we believe that almost all engine owners should consider one. These fluids are important and they do many jobs. Some are even suitable for your mobile water pump. Others are compatible with your transmission. Some will prevent build up inside your locks and hoses. Others come in formulations that can be utilized by your radiator. The important thing to remember is that engine washes aren’t simple – there are a lot of unique combinations out there for all the different systems your engine might have to deal with, so you’ll want to shop around a bit.

Our Recommendation

NameCategoryProduct
CRC SX128 Salt Terminator Engine FlushBest OverallCRC SX128 Salt Terminator Engine Flush
Prolong Super Lubricants PSL11000 Engine TreatmentBudget PickProlong Super Lubricants PSL11000 Engine Treatment
Liqui Moly 2037 Pro-Line Engine FlushUpgrade PickLiqui Moly 2037 Pro-Line Engine Flush