Best Radiator Coolant Additive for 2022 (Review)

Sometimes it might be quite difficult to find the best radiator coolant additive. With every niche market offering so many different products, it makes sense that this is the case.

Unfortunately, this very fact can make it incredibly difficult to find the item that best suits your needs, which is why we’ve put together this radiator coolant additive buying guide.

Our Top 10 Picks:

The 10 Top Radiator Coolant Additive Reviews:

Bestseller No. 1
Royal Purple 01600 Purple Ice Super-Coolant Radiator Additive - 12 oz.
  • OPTIMIZES PROTECTION
  • Prevents erosion and electrolysis
  • Compatible with all coolants types
  • Contains lubricants to protect the water pump
  • Fit type: Vehicle Specific
SaleBestseller No. 2
VP Racing Fuels Madditive Cool Down - Radiator Systems Temperature Decrease 16 Ounces for All Radiators. Decreases Engine Temps up to 30 Degrees
  • Cool Down coolant additive improves the performance of coolant and is safe for all radiator systems. It's ideal for racing, street, RV and tow vehicle applications
Bestseller No. 3
Hy-Per Lube HPC100-3PK High Performance Super Coolant - 16 oz, (Pack of 3)
  • Reduces Engine Cylinder Heat Temperatures
  • Allows Safe Advancement of Ignition Timing Resulting in More Horsepower
  • Prevents Overheating in High Performance and High Load Engines
  • Complete Protection from Rust, Corrosion and Electrolysis
  • Compatible With All Types of Antifreeze, does not contain ethylene glycol
Bestseller No. 4
Design Engineering 040200 Radiator Relief Coolant Additive for All Water Cooled Engines, 16 oz.
  • No mixing required; just add to cooling system and reduce engine operating temperature up to 30 degrees Fahrenheit
  • Formulated with a corrosion inhibitor and reduces pre-existing scale build-up
  • For use in all water cooled engines
  • Compatible with water and all anti-freeze mixtures
  • Safe with all alloys - 100% biodegradable, non-corrosive and non-toxic additive
SaleBestseller No. 5
K-Seal ST5501 Multi Purpose One Step Permanent Coolant Leak Repair, Blue
  • Permanent Coolant Leak Repair - Just Shake, Pour And Go
  • Mixes With All Antifreeze
  • No Draining Or Flushing
  • Fixes Cracks And Leaks In Radiator, Head Gasket, Freeze Plugs, Cylinder Heads, Heater Core, Water Pump Casing And Engine Blocks
Bestseller No. 7
Red Line (80204) Water Wetter - Coolant Additives - 12 Oz Bottle
  • Cutting edge technology - We at red line created this industry, pushing bubbles out of the way to ensure efficient & effective engine cooling
  • Ultimate cooling performance - Coolant additive with a unique agent that lowers temperatures by reducing and eliminating bubbles or vapor barrier that form on hot metal surfaces
  • Perform & protect - Waterwetter protects from rust & corrosion, allowing the use of straight water in racing or reduced antifreeze levels in warm climates
  • Easy to use - Use one bottle for most cars & light trucks, treats 3 to 5 gallons. Larger cooling systems should use 2 bottles; Small cooling systems should use 1oz per quart
  • Why red line - Established in 1979, red line products perform & protect better than any on the market. No compromises
Bestseller No. 8
Mishimoto - MMRALC Liquid Chill Radiator Coolant Additive
  • Formulated to prevent future corrosion and reduce existing build-up
  • Decreases high coolant temperatures and does not require mixing
  • Net Weight: 4 fl oz. / Note: Non-corrosive 100% recyclable
  • Truck & SUV: 2 bottles / Sport Compact Cars: 1 bottle / ATV & Dirt Bike: 1oz per qt
  • Mishimoto Lifetime Warranty
SaleBestseller No. 9
Lubegard 96001 Kool-It Supreme Coolant Treatment, 16 oz.
  • 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
Bestseller No. 10
Genuine Ford Fluid VC-8 Diesel Cooling System Additive - 16 oz. , RED
  • Replaces fluorescent green-colored V119 premium antifreeze/coolant meeting Ford specification ESE-M97B44-A
  • 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

Last update on 2022-11-30 / Affiliate links / Images from Amazon Product Advertising API

How to find the best radiator coolant additive?

Here, we’ll be going over a number of factors that you can use to ensure that you’re purchasing the best radiator coolant additive for you.

Regardless of which type of item you’re looking to buy, chances are that there are existing buying guides on the internet, all of which aim to give you good radiator coolant additive recommendations.

Despite these recommendations, however, it’s always a good idea to do your own research. In addition to this research, asking yourself the following questions is also super helpful:

  • What features does the radiator coolant additive need to have to be perfect for my needs?
  • What is my budget?
  • Do I need to purchase a certain brand?

Once you’ve answered these questions and have a good idea of what you’re looking for and the buying process becomes much easier. Keep in mind that when looking for the best product, there’s no need to rush. In fact, very rarely are the ideal products found by choosing the first one you see or by basing your decisions on only one factor. Take your time and enjoy the process!

Now, with the answers to the previous questions in mind, we urge you to use our upcoming buying guide for radiator coolant additive to find what you’re looking for:

Brand

In some cases, the brand of radiator coolant additive is very important. For example, if you’re looking for an item that works in tandem with another, you might very well need both products to be the same brand. If this is the case, it’s vital to pay attention to this factor, as choosing the wrong product can mean the difference between wasting your money and buying a great product that functions as it should.

Features

The features in any given radiator coolant additive are important because they can dictate which version of an item you need and how much money you need to spend. Consider all the key features that you want your item to have and don’t settle for anything that doesn’t check at least ¾ of your boxes.

Reviews

Customer reviews about radiator coolant additive are crucial – especially when you’re buying a product that costs a lot of money or serves a big importance. Luckily, most products can be found online, which means that it’s common for there to be scores of customer reviews from those who have already purchased any given product.

Pay attention to these reviews. Take note of the pros and cons that they mention, and factor these into your big decision. In some cases, you’ll be forced to sacrifice one con in order to gain a particular pro, but being aware of the potential con is going to be beneficial in either case.

Quality

Of course, quality is key. You don’t want to purchase a low-quality product. If you do, you run the risk of your item breaking, not working properly, or otherwise proving to be very disappointing, as well as a waste of money.

You can compare radiator coolant additive quality by researching what your potential purchases are made from, contrasting the individual items against each other to discern which one is made of the best materials.

Warranty

Warranty isn’t always going to be important, but it definitely can be. This is especially true if the item in question is tech-related or expensive. A good warranty will be valid for an extended time after purchase and cover a variety of problems ranging from item defects to random accidents, water damage, and other miscellaneous events that could ruin your product.

Conclusion

The quest to find the best radiator coolant additive can be daunting – but it doesn’t have to be. It can be made much easier by asking yourself a few simple questions and then thinking critically about the items you want to buy. Consider their features, quality, brand, warranty, and customer reviews and you’re more likely to make a great purchase.