Are you trying to find coolant additives among various brands on the market but aren’t sure where to begin? To assist you in finding the right one, we’ve put together a list of the 7 best to help you pick the perfect one!
We investigated and evaluated a number of the top-selling coolant additives on the market in order to create our list of the best. Making a decision among the many options available is never simple. There are an infinite number of models available, each with a distinct price. And as you’ll find out, the best options aren’t usually the ones you imagine! This comparison is rich and relevant because of the numerous factors that were employed. You will find products featured in this ranking not only based on their pricing but also on their features and other customers reviews. To write this review, we completed 11 hours of research and did 59 coolant additives tests. You won’t need to pick products at random any more. If you’re unsure of what to look for, browse our list and consult the buying guide!
An overview of our top picks
Table of contents
The best coolant additives you can buy today
- REDUCES ENGINE TEMPERATURE: Rislone Hy-per Cool Super Coolant contains New Technology wetting agents which lower the surface tension of the water/coolant mixture, allowing it to improve the heat transfer of your cooling system
- PREVENTS OVERHEATING: This will make your system dissipate more heat more efficiently, reducing engine temperatures by up to 25°F helping to prevent overheating.
- MAXIMUM CORROSION PROTECTION: Super Coolant lubricates and protects water pump seals, and helps prevent corrosion of ALL metals commonly found in cooling systems, including Aluminum.
- COMPATIBLE WITH ALL TYPES AND ALL COLORS OF ANTIFREEZE COOLANT: Use in gasoline classic cars, hot rods, trucks, RV’s, motorcycles, automotive, heavy duty, diesel, powersports ATV, off road, racing, towing and most anything else with a cooling system.
- MADE IN THE USA
- UNIQUE AGENT - for cooling systems that doubles the wetting ability of water
- RUST AND CORROSION PROTECTION - allows for use of straight water in racing or reduced antifreeze levels in warm climates
- DIRECTIONS FOR USE - one bottle for most passenger cars and light trucks, treats 3 to 5 gallons or 13.2 to 15.9 liters, vehicles with larger cooling systems should use two bottles, small cooling systems should use 1oz (3 to 4 capfuls) per quart
- POPULAR FOR USE IN - new or used antifreeze (including DEX-COOL and long-life versions) to improve the heat transfer of ethylene and propylene glycol systems, satisfies ASTM D2570 and ASTM D1384 corrosion tests for glycol-based antifreezes
- WHY RED LINE - Established in 1979, Red Line Products perform & protect better than any on the market. No compromises
- MAXIMIZE PERFORMANCE: Contains wetting agents to increase coolant flow for better heat transfer and reduces coolant temperature by up to 30°F
- PROTECTIVE TREATMENT: Provides superior heat dispersion while lubricating vital components like water pumps and seals and protecting the sensitive quality of aluminum alloy radiators
- HIGH STANDARDS: Meets/Exceeds ASTM specifications for fully-formulated engine coolant, including ASTM D3306. Always maintain a minimum of 15% antifreeze in cooling systems of street driven vehicles with A/C. Safe and legal for track use because it does not contain glycol
- COMPETITIVE EDGE: Engineered to keep your operating temperatures at optimum performance to not lose power through excess heat; Cool Down is safe for vehicles over all types of terrain and offers superior heat reduction
- EASY TO USE: Premixed and ready to pour, allowing you to maximize horsepower and performance. One 16oz bottle treats cooling systems of 12-20 quarts and lasts for one year or 30,000 miles. For diesel applications use twice the amount for full protection of wet sleeve cylinder liners. For powersports applications use 2 oz. per quart of coolant
- UNIQUE AGENT - for cooling systems that doubles the wetting ability of water
- RUST AND CORROSION PROTECTION - allows for use of straight water in racing or reduced antifreeze levels in warm climates
- DIRECTIONS FOR USE - one bottle for most passenger cars and light trucks, treats 3 to 5 gallons or 13.2 to 15.9 liters, vehicles with larger cooling systems should use two bottles, small cooling systems should use 1oz (3 to 4 capfuls) per quart
- POPULAR FOR USE IN - new or used antifreeze (including DEX-COOL and long-life versions) to improve the heat transfer of ethylene and propylene glycol systems, satisfies ASTM D2570 and ASTM D1384 corrosion tests for glycol-based antifreezes
- WHY RED LINE - Established in 1979, Red Line Products perform & protect better than any on the market. No compromises
- OPTIMIZES PROTECTION
- Prevents erosion and electrolysis
- Compatible with all coolants types
- Contains lubricants to protect the water pump
- Fit type: Vehicle Specific
- Protects all metals from chemical electrolysis
- Provides unsurpassed cooling system corrosion protection
- Enhances heat transfer and reduces operating temperatures
- Prevents deposits which lead to overheating
- Provides 2-in-1 corrosion protection and temperature reduction
- Provides complete protection from corrosion and chemical electrolysis
- Protects wet sleeve cylinder liners from cavitation erosion
- Prevents build-up of scales, deposits and slime that cause overheating
- Significantly extends life of water pump impellers and seals
- Subaru Genuine Coolant System Conditioner
- Specifically formulated for Subaru vehicles
- Helps prevent corrosion in your Subaru's cooling system
- Subaru OEM Coolant System Conditioner
- MOTOR MEDIC is a local family owned company based out of Charlotte, NC. For more than 75 years, LIQUID WRENCH products, developed by the people who use them, has earned the trust of hard-working tradesment and the active DIYer through consistent, superior performance and a commitment to innovation. MOTOR MEDIC
- Package Dimension : 2.72 inches L x 2.72 inches W x 5.69 inches H
- Country of Origin: UNITED STATES
- Item Package Weight : 0.88 pounds
- Prevents leaks
- Prevents overheating
- Extends cooling system life
- Prevents the formation of rust and scale
- Promotes proper engine temperature regulation
- Replaces fluorescent green-colored V119 premium antifreeze/coolant meeting Ford specification ESE-M97B44-A.Fit Type: Universal
- Replaces yellow-colored Motorcraft gold antifreeze/coolant meeting Ford specification WSS-M97B51-A1
- Designed to replace additives depleted between coolant change-outs
- Now dyed yellow to eliminate engine coolant color change when mixing
- Genuine OEM
- Protects against boil over to 265°F and freezing to -26°F
- Reduces engine wear and inhibits corrosion
- Safe for all radiators and all gas/diesel engines
- Premixed coolant provides year-round protection
- Mishimoto Lifetime Warranty
- Reduces temperatures
- Protects water pumps
- Made in the USA
- Made in the USA
- Choose from a stunning range of vibrant colors to complete your custom cooling system and enhance your build.
- Long lasting pre-mixed performance coolant is ready to go right out of the bottle, with no additional additives or inhibitors required.
- Protects copper, brass, and nickel with advanced corrosion.
- PREDILUTED ANTIFREEZE AND COOLANT: Engineered to support any vehicle's engine cooling system to enhance performance and provide protection. This item contains a bittering agent called Denatonium Benzoate.
- PROPRIETARY BLEND: Contains 10X the scale-fighting inhibitors to ensure maximum cooling performance while protecting against scale, corrosion, and other damage
- SUPERIOR CHEMISTRY: Free from 2-EHA, silicate, nitrite, borate, and amines to keep your vehicle functioning in prime condition
- UNIVERSAL FORMULA: Compatible with any color or type of existing antifreeze and coolant in your car's system
- LONG-LASTING: Offers 2X the average warranty coverage, cooling your engine system for over 10 years or 300,000 miles of service
- UNIQUE AGENT - for cooling systems that doubles the wetting ability of water
- RUST AND CORROSION PROTECTION - allows for use of straight water in racing or reduced antifreeze levels in warm climates
- DIRECTIONS FOR USE - one bottle for most passenger cars and light trucks, treats 3 to 5 gallons or 13.2 to 15.9 liters, vehicles with larger cooling systems should use two bottles, small cooling systems should use 1oz (3 to 4 capfuls) per quart
- POPULAR FOR USE IN - new or used antifreeze (including DEX-COOL and long-life versions) to improve the heat transfer of ethylene and propylene glycol systems, satisfies ASTM D2570 and ASTM D1384 corrosion tests for glycol-based antifreezes
- WHY RED LINE - Established in 1979, Red Line Products perform & protect better than any on the market. No compromises
- HASSLE-FREE APPLICATION: Already pre-mixed in a convenient bottle, ready to use without any complicated mixing or measuring. Simplify your coolant change with this ready-to-pour formula. Direct coolant replacement (not an additive)
- COOLING EFFICIENCY: Advanced formula containing heat transfer agents for exceptional cooling, reducing the risk of overheating and enhancing your vehicle's performance in demanding seasonal conditions
- PROTECTION YOU CAN COUNT ON: Proprietary blend of heat transfer agents that lubricate water pumps and prevent damage of sensitive aluminum cooling system metals. Freeze protection down to 0°F (do not add additives)
- MEETS ASTM STANDARDS: High quality formula you can trust to protect your vehicle's engine
- COOLING ADVANTAGE: Achieve optimal engine performance with reduced engine temps up to 14°F and 25°F at cylinder heads
- Single Quantity
- No Core Charge Req.
- Weight: 0.8lbs
How to choose a good coolant additives
Does the idea of finding a fantastic coolant additives make you anxious? When it comes to purchasing this product, specifically when deciding which model to select, has your head been spinning between options? You are not alone if that is the case. We are aware of the pressure involved in the purchasing process!
Your presence here indicates that you are interested in coolant additives. Before choosing which product would be the best for your needs after being inundated with information, locate a reliable source with genuine selections. You can get that information from a variety of sources, including buying guides and rating websites, word-of-mouth recommendations from friends and family, online discussion forums where users can share their own experiences, product reviews that can be found all over the internet, and YouTube channels. You can only get the right product through exhaustive analysis. But you realize that’s not always simple. In order to ease your concerns, we have taken the time to develop a list of the top coolant additives products available right now. You might be wondering how we came up with the list. How was this buying guide developed?
First, we used our algorithms to gather as much reliable data as we could about these products. To verify all the data gathered, we used both artificial intelligence and a lot of algorithms.
Then, our experts used criteria that are recognized in the business to evaluate them according to their quality to price ratio, allowing us to choose the top coolant additives on the market right now!
The selection of the goods is not arbitrary. Before creating a list, we take into account a number of factors. Below are some of the criteria discussed:
Brand Value: What happens if you choose a dubious brand just because it appears to be a good deal? So the likelihood of receiving a product with a short shelf life increases. That is due to the fact that well-known brands have a reputation to uphold, while others do not. Top coolant additives brands strive to provide some distinctive traits that set them apart from the competition. So, hopefully one or more of the items on our list will be perfect for you.
Features: Useful features are all you need, not tons of them. We consider the important aspects and select the top coolant additives based on those.
Specifications: Numbers always help you measure the quality of a product in a quantitative way. We try to find products with higher specifications, but with the right balance.
Quality: A product’s quality may always be quantified with the aid of numbers. We look for goods with better standards that strike the proper balance. The best quality product that gets highly appreciated and recommended by experienced users.
Customer ratings: Would it be accurate to suggest that the coolant additives were used by hundreds of customers before you? Superior ratings indicate that many customers had better service.
Customer Reviews: Like ratings, provide you with accurate and reliable information about the product from genuine customers. Customer ratings are very important to all of us because they contain accurate and reliable information about the customer service we received from several hundred customers.
Seller Rank: This is very intriguing! Not only do you need a good coolant additives, you also need a product with rising sales that is trendy. It accomplishes two goals. First, the expanding user base proves the quality of the product. Second, given that number, producers must be able to offer greater quality and after-sales support.
Value: You get what you pay for, they say, so consider the value. Cheap isn’t always good and expensive isn’t always bad. However, that does not imply that spending a lot of money on a product that is flashy but underwhelming is a good idea. Before adding them to the list, we make an effort to evaluate how much value you can get for your money from your coolant additives.
Durability: Durability and reliability are closely related concepts. You will benefit from a strong and long-lasting coolant additives for months and years to come.
Product availability: Products come and go, and new ones replace the old ones. Most likely, a few new features and required changes were made. What use is it to use a supposedly good product if the maker no longer supports it? We make an effort to highlight products that are current and offered by one or more trustworthy sellers, if not more.
Negative Reviews: Yes, we do take that into account as well! The goods with the majority of bad reviews are filtered out and disregarded when we choose the best-rated one on the market.
These are the standards by which we selected our coolant additives. Do we end our process there? Hell no. The most crucial fact about us that you should be aware of is that we regularly update our website with current and pertinent information. We have one more layer of filtration since we place the greatest importance on reader satisfaction. Please let us know if any product included here is incorrect, irrelevant, subpar, or simply out of date. We always value your opinions, and we’ll work hard to make any necessary corrections to our list in response to them.
Why should you believe us?
There are now thousands of possibilities for these products on Amazon, but choosing the best one can be difficult and time-consuming. And what coolant additives should you purchase in 2022?
This guide is the result of more than 10 years of experience in researching, testing and writing about many topics. Each member of our team is an authority in their area. We read every article we could find online and every consumer review on every retail website for seven hours. Additionally, we discovered a ton of websites that offered helpful resources, including buying tips and thorough information on coolant additives.
