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The Best Coolant Additives: A Buyer’s Guide 2022

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Engines are kept cool by coolants. It is easy to overlook checking your coolant, but it’s just as vital as checking your oil when it comes to your automobile. Coolant protects the motor and cooling system against corrosion by raising the boiling point of the cooling system in the summer and lowering the freezing point in the winter.

While driving in cold or hot weather, these features safeguard the engine from overheating or freezing. It shields your automobile from severe temperatures and saves you money on unnecessary car repairs.

Different types of coolants are required for various automobiles. There are variants for every sort of car, including diesel engines, as well as automobiles from the United States, Asia, and Europe. In this article, we will go over the kind of coolant additives you need for your car and how to choose them.

What To Consider Before Buying Coolant Additives

Boiling And Freezing Points

The best engine coolant has the highest boiling point and the lowest freezing point. It must be able to tolerate a lot of heat and remain stable even when temperatures exceed 200 degrees Fahrenheit. It must also avoid forming frost on engines at temperatures below -20 degrees Fahrenheit.

Radiator coolants will also be heavily influenced by your surroundings. If you reside in a region where temperatures can dip under 34 degrees Fahrenheit, look for a product with a 70/30 or 60/40 coolant to a distilled ratio of water.

Keep in mind that the greater the antifreeze content, the lower the freezing point it can withstand. A 50/50 blend, on the other hand, can transfer heat more effectively. As a result, it is safe in temperatures as low as -30 degrees Fahrenheit.

Liquid Color

Antifreeze coolants come in a variety of hues to indicate that the liquid is prepared differently chemically. Green coolants, for example, are made with Inorganic Acid Technology (IAT) and contain silicates and phosphates to avoid corrosion.

Meanwhile, orange coolants are made with Organic Acid Technology (OAT) and contain corrosion-preventive chemicals. Orange coolants also have a 3-year lifespan compared to green coolants.

Corrosion Inhibitors

The brass, aluminum, and alloy sections of engines rust frequently, reducing the longevity of your car engine. Most engine coolants are made up of water and ethylene glycol (or propylene glycol), but varying additions to prevent corrosion result in different types of coolant. Depending on the country of origin, these various ingredients may differ.

Anti-corrosion compounds, such as carboxylates and phosphates, are used in the engine coolant of Asian cars, for example. Silicates cannot be used as an anti-corrosive element in engine coolants for Asian-made vehicles. Engine coolant in European cars, on the other hand, is made up of a combination of silicates and carboxylates to guard against corrosion.

Nobody likes to put the incorrect antifreeze in their vehicle. As previously stated, ethylene glycol is an active constituent in engine coolant. It prevents the liquid in your engine from freezing and evaporating.

However, due to its high toxicity, it may irritate your skin. As a result, extra caution should be exercised when using this antifreeze coolant. Propylene glycol has a denser texture and better heat transfer. It is also less harmful, which is why the majority of automobile owners prefer this form of coolant.

Engine And Fuel Type Compatibility

It’s important to note that diesel engines are not the same as gasoline engines. As a result, the antifreeze requirements for these two gasoline types will differ.

Cylinder wall rust is more common in diesel engines. To prevent damage, it is ideal if you replace its radiators with antifreeze having Supplemental Coolant Additives (SCA).

Its engines are prone to overheating, necessitating the usage of antifreeze with a high boiling point. Nonetheless, it’s a good idea to double-check the car’s manual to make sure you’re using the right product.

Type Of Additive

Most antifreeze coolants contain additives that offer the lubricant additional qualities to improve its performance. Demineralized water, prepared as a 50/50 mix, is a typical ingredient. Ethylene glycol, which has a low melting point and is inexpensive to create, is another frequent addition. Non-toxic additives such as silicates, phosphates, and propylene glycol protect the vehicle’s cooling system from corrosion.


The majority of engine coolants contain 50% water. Water is not present in pure antifreeze. A coolant is made by mixing water with antifreeze according to the manufacturer’s specifications. Some automobile owners prefer to do it themselves, while others prefer to buy pre-mixed coolant.

Ethylene Glycol

Ethylene glycol is the principal active element in most engine coolants. It was first used as a cooling agent following World War I. This chemical keeps the liquid moving through your car’s engine from freezing in the winter and evaporating in the summer.

Propylene Glycol

This is a kind of polyethylene glycol. Propylene glycol, rather than ethylene glycol, is used in some engine coolants. Since propylene glycol has a higher viscosity, ethylene glycol has a better heat transfer efficiency. When swallowed, propylene glycol is less hazardous, which is a big selling factor for vehicle owners with children and pets.


The majority of engine coolants include 50% water, although some are already watered down. Some car owners prefer ready-to-use diluted brands that do not require the addition of water. Others, on the other hand, prefer to make their own antifreeze by mixing water and antifreeze.

To get the appropriate balance, always read the label before combining water with antifreeze. Non-distilled water should also be avoided because its mineral content might hasten rusting and oxidation.

Benefits Of Coolant Additives

Since we’ve already gone over the benefits of coolant additives in detail, hopefully you’ve already come up with a few ideas. Let’s go over all of the advantages one by one.

  • Antifreeze saves money on maintenance because it protects many parts of a vehicle.
  • It reduces the likelihood of a vehicle breakdown. The majority of car breakdowns are caused by issues with the vehicle’s cooling system. You can safeguard your car and avoid breakdowns by using coolant additives correctly.
  • Engine particles are protected from rust, cracking, and corrosion.
  • A location’s weather is not always consistent. The state of an engine may alter as a result of climate change. Coolant additives assist the engine in staying warm when it’s too cold outside, preventing it from cracking.
  • It ensures that the water pump and other items are well-lubricated. This also aids in the correct maintenance of the vehicle.

What Coolant Should I Use In My Car?

The optimal engine coolant for your car is determined by the vehicle’s type, age, and manufacturing location.

Selecting the incorrect product might lead to poor performance or, even worse, engine failure. Read the instructions to ensure that you make the best decision possible.

Make Sure The Color Is Right

Coolant comes in a variety of hues, each of which corresponds to different car suitability. IAT coolant, for example, is usually green, while HOAT coolant is usually turquoise. However, keep in mind that color isn’t always a reliable sign of the correct coolant for your vehicle.

Certain brands, which are created for specific automobile types and countries of origin, come in a wide range of colors. Use color as a reference, but always read the label to ensure that the coolant is compatible with your vehicle.

Read The Source

The owner’s manual for your car contains a plethora of information. It will advise you on the optimal sort of coolant to be used in your automobile. You can probably locate the information you need online if you don’t have a copy of your owner’s handbook.

The formulas recommended by your dealership and in your owner’s handbook are most likely OEM-approved, but there are certainly aftermarket counterparts to pick from.

Remember To Bring Water

Always read the bottle when replacing your car’s coolant to discover if the formula requires it to be mixed with water. Some coolants can be put directly into your vehicle’s system without any additives, while others are made to be mixed 50/50 with water. Softened tap water will suffice.

3 Best Coolant Additives For Your Car

Red Line Coolant Additives

Due to its cutting-edge design, Water Wetter is one of the greatest coolant additives. It guarantees the motor’s proficiency and keeps it cool.

This coolant additive has a special chemical that helps to keep the engine cool. It removes vapor boundaries that form on heated metal areas, preventing bubbles from forming. The chemicals in your coolant safeguard your engine from rust and corrosion. If you live in a warm environment, you can therefore use only a small amount of antifreeze or plain water.

Furthermore, the coolant is both simple to use and affordable. It is ideal for medium cooling systems, such as those found in vehicles and light trucks. Two bottles are required for a bigger cooling system.

Moreover, in plain water, Water Wetter protects the engine from degradation and rust. Because it is compatible with both old and new antifreeze, it may readily reduce antifreeze levels in hot areas by increasing the heating transfer mechanism of ethylene and propylene glycol systems. As a result, it can maintain the engine’s balance.

Red Line Water Wetter is unquestionably living up to its name by refusing to compromise on quality at any level. It is undeniably the best coolant addition because of this factor.

This product is ideal for all-terrain automobiles, SUVs, street, off-road, and sports motorcyclists, street motorbikes, snowmobiles, as well as other marine private vessels.

Royal Purple’s Purple Ice

Royal Purple’s Purple Ice is well-known for its high quality as a coolant additive. As it contains no glycol, this powerful coolant is among the finest products on the market. It can be used with either water or antifreeze. It is effective with cooling system additives that slow down or entirely halt leaks, despite the fact that it does not give freeze protection.

It has the ability to lower the temperature by up to 22 degrees Fahrenheit. It aids in the production of greater horsepower by lowering the coolant’s water surface tension and moving heat away from the radiator.

It protects the engine and cylinder head to the utmost extent possible and reduces the risk of engine failure. It keeps the system cool, which reduces overheating. As a result, the water pump’s lifespan is extended.

The benefit of this super coolant is that it may be used in diesel engines as well. In this engine type, it aids heat transfer and decreases cavitation. It also protects your motor from rust all year because it’s a high-performance radiator booster.

Cummin Filterator Additive

Cummin Filteration Additive has a variety of additives to choose from. It improves the engine’s efficiency and upholds the engine’s specifications. It protects the engine from corrosion and provides protection by forming shields against the elements.

It protects engine parts from corrosion by lubricating them. Furthermore, it is cost-effective. It improves the engine’s performance and gives you a more comfortable ride.


What Is The Purpose Of Engine Coolant?

Coolants keep vehicles from overheating in warm temperatures and freezing when it’s cold. Coolant is required for a vehicle engine to work safely and effectively. It flows through the car engine to maintain the temperature.

To prevent damage to a vehicle’s cooling system, it is necessary to flush the engine on a regular basis. Your car’s radiator, water pump, and pipes are all part of it. When it’s time for your vehicle’s scheduled engine cleaning, it’s best if you also choose the right coolant.

Which Engine Coolant Is The Best?

The best coolant for your car will always be determined by its kind, age, type, and manufacturer. Knowing the year, make, and model of your vehicle will make choosing the right engine coolant much easier.

It’s important to keep in mind that utilizing the improper product can result in poor vehicle performance and motor failure. A quick tip: car coolants come in a variety of colors to make it easier to determine whether or not they are compatible with your vehicle. The IAT coolant is often green, whereas the HOAT (Hybrid Organic Acid Technology) is blue.

However, other brands’ hues may differ, especially if they are imported from other nations. As a result, color may not always be the best predictor when selecting the appropriate coolant. It’s usually a good idea to check the label to be sure the coolant is compatible with your vehicle.

Finally, the primary source of information is your car’s owner’s manual. Always refer to it while deciding which coolant is best for your car. If you don’t have one, you can usually get one from the manufacturer’s website.

Can I Mix The Coolant With Water?

Some coolants can be used without adding any water or additives. Certain varieties, however, require a 50/50 water mix. When using antifreeze and additives in your car engine, make sure you use the right ratio.

You don’t want to make a coolant that would be too mild or too strong because it will damage the performance of your car. It all comes down to the make and model of the vehicle you own. Also, always check the label to see if it requires mixing with water.

How Do I Know When My Coolant Needs To Be Changed?

Replace your coolant as soon as it no longer feels slick. This indicates that the molecules have dissolved and the coolant’s anti-corrosion properties have been lost. You could also heed the product’s recommendations for when to replace the coolant.

Why Are There So Many Colors Of Antifreeze Coolants?

Color-coding is a way employed by manufacturers to indicate the coolant’s production style. Blue, dark green, or red are the colors of organic coolants. Green or yellow are the colors of inorganic coolants. HOAT comes in three colors: orange, blue, and yellow.

Final Thoughts

Finding the right coolant additive for your vehicle does not have to be difficult. Use the one that is specifically advised for your vehicle’s engine. To confirm that you are using the correct product, consult the manual or contact the manufacturer of your vehicle.

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