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Published May. 20, 2019

Whether you ride a Honda or a Harley, motorcycle coolant is vital. This liquid helps the bike stay cool by transferring heat away from the engine block to a radiator where it can be dispersed in the outside world. Over time, the coolant in your motorcycle can deteriorate, leading to a whole host of mechanical issues. For this reason, it’s important to choose a high-quality coolant that’s formulated to last.

Working out exactly which coolant is best for your bike can be tricky, but luckily Car Bibles is here to help. Below, we run through the best motorcycle coolant options available, so you can make an informed decision. In our handy buying guide, we also run through some important information about engine coolant: how it works, how often to replace it, and more, so you can get the most out of your bike.

The Best Motorcycle Coolant

Kicking off our list is this high-quality coolant from Honda. The all-in-one solution will help your engine keep a steady temperature year round, since it acts as motorcycle antifreeze as well as coolant. Engineered specifically for Honda and Acura vehicles, it’s the perfect option for a wide range of bikes. Being free from silicates — a conventional antifreeze ingredient that can deteriorate over time — the durable coolant has an impressively long life. In fact, many motorcycle enthusiasts note that this solution continues to work well after as many as five years. It’s also made with de-ionized water, to ensure it won’t form a scale on engine components. The solution is simple to use, too: ready-mixed, the coolant can be put to use straight away. Drivers across the board were impressed with the functionality, durability, and budget-friendly price point offered by Genuine. If in doubt, this rugged coolant and antifreeze solution is always a safe bet.

Key Features
  • Coolant and antifreeze formulated for Honda and Acura vehicles
  • Free from silicates
  • Made with de-ionized water
  • Ready mixed for immediate use
  • Provides a service life of up to 5 years
  • Budget friendly price point
Specification
  • Brand Genuine
  • Model OL999-9011
  • Weight 9.15 pounds

This Engine Ice coolant has also earned a spot on our list. Engine Ice are well known for producing high quality coolants, and this option is no exception. Unlike many options on the market, this unique formula is biodegradable, and non-toxic. It’s also phosphate-free, for a longer lifetime. Each bottle arrives ready mixed, and ready to use, for maximum convenience. In use, the coolant  effectively keeps boil over temperatures to 256 degrees Fahrenheit, while offering antifreeze protection at temperatures up to -24 degrees Fahrenheit. In other words, the engine is kept at its optimum temperature whatever the weather or season. On average, the coolant will reduce your engine’s operating temperature by 20 degrees, making it the perfect dirt bike coolant, or racing coolant. In fact, it’s approved for use on a number of racetracks world wide. The high performance formula will also keep corrosion at bay, whether the cooling system is copper, cast iron, aluminum, steel, or magnesium and solder. It also contains propylene glycol, known for its ability to prevent pump gasket failures.

Key Features
  • High performance coolant, suitable for street and race applications
  • Biodegradable and non-toxic
  • Ready mixed for easy use
  • Keeps boil over temperature at 256 ℉
  • Offers antifreeze protection down to -24℉
  • Lowers average engine temperature by 20℉
  • Approved for use on a number of race tracks, world wide
  • Keeps corrosion at bay in all types of coolant systems
Specification
  • Brand Engine Ice
  • Model TYDS008-03
  • Weight 14.75 pounds

Honda has earned themselves a second spot on our list, thanks to their ready to use coolant. This new blend is fully compatible with their original green coolant, so there’s no need to flush out your bike’s system prior to use. The versatile solution is suitable for use with practically any motorcycle, ATV, UVT, or even snowmobile, making it a good choice for garages with more than one vehicle. Made with 50% water, 50% glycol, and other ingredients, the coolant strikes the perfect balance for consistent engine temperature. It also contains a non-abrasive corrosion inhibitor, providing your cooling system with excellent protection. Thanks to its carefully blended formula, the coolant offers antifreeze protection at temperatures as low as -34 degrees Fahrenheit. Meanwhile, a high boiling point of 265 degrees Fahrenheit ensures it’s well equipped for year-round use. Drivers say that the coolant works perfectly, keeps cooling ports clean, and offers excellent value for money.

Key Features
  • Honda coolant, compatible with their earlier green coolant
  • Suitable for any motorcycle, ATV, UTV, or snowmobile
  • Made with 50% water (ready mixed for ease of use)
  • Contains a non-abrasive corrosion inhibitor
  • Provides antifreeze protection at temperatures as low as -34℉
  • High boiling point of 265℉
  • Great for year-round use and value for money
Specification
  • Brand Honda
  • Model 08C50-C321S02
  • Weight 6.4 ounces

The next motorbike coolant to earn a place on our list is by EVANS. The fluid is formulated to work in harmony with as many different vehicles as possible — modern and classic, gasoline and diesel — making it a great option if you have more than one motorcycle. With an impressively high boiling point of 375 degrees Fahrenheit, the rugged coolant won’t vaporize even with intense driving, eliminating boil over, and reducing the strain on your system. EVANS has achieved this high boiling point by creating a water-free formula. This lack of water also prevents corrosion and cavitation, keeping maintenance costs low over time. By significantly lowering the engine temperature, the coolant prevents a host of issues too, including pre-ignition and engine knock. Without the interference of these issues, your vehicle can run more efficiently and achieve better fuel economy. This coolant may be a little pricier than other options on our list, but the cost is far outweighed by the money you’ll save on fuel and maintenance.

Key Features
  • High performance engine coolant, suitable for most modern and classic vehicles
  • Boiling point of 375℉
  • Reduces strain placed on your cooling system
  • Water-free formula virtually eliminates corrosion and cavitation
  • Lowered engine temperature prevents pre-ignition and knocking
  • Improves the vehicle’s fuel efficiency
Specification
  • Brand EVANS
  • Model EC53001
  • Weight 5 pounds

The next motorcycle radiator fluid to find a place on our list is by Maxima. The ready to use formula combines cooling and antifreeze properties, making it perfect for year-round use. The premium blend carefully balances 50% deionized water with antifreeze ingredients, so your engine can keep performing in temperatures as low as -34 degrees Fahrenheit. With a high boiling point of 265 degrees Fahrenheit, the coolant is just as able to take the heat during the summer months. As well as protecting your engine against extreme temperatures, the coolant is also designed to stand up to corrosion and cavitation, thanks to anti-foam agents and glycol. Thanks to its low-silicate content, the fluid is perfectly suited to use with virtually any motorcycle. Whether your vehicle’s cooling system is made from aluminum or magnesium, the formula offers great results, without doing damage.

Key Features
  • Engine coolant, ideal for use with most motorcycles
  • Contains 50% deionized water
  • Keeps your engine functioning at temperatures as low as -34℉
  • Boiling point of 265℉
  • Protects against corrosion and cavitation in the cooling system
  • Contains anti-foam agents
  • Low-silicate formula
Specification
  • Brand Maxima
  • Model 82964
  • Weight 4.3 pounds

Royal Purple has also earned a spot on our list, thanks to its coolant additive. With its two-in-one corrosion inhibitor and wetting agent, the formula offers enhanced protection of your aluminum cooling system. Its advanced blend helps boost your coolant’s performance, and maintain the cooling system — all without the need for a coolant flush. It works to improve engine efficiency by reducing the coolant’s surface tension. This tweak allows heat to travel more easily, and better radiate away from the engine. The additive significantly reduces hot spots in the vehicle’s engine and cylinder heads. In use, it can reduce the coolant’s average temperature by as much as 22 degrees Fahrenheit, resulting in greater efficiency, and greater power. Thanks to its impressive corrosion resistance, this handy additive can also increase the lifespan of the cooling system it services.

Key Features
  • Coolant additive for motorcycles
  • Includes a 2-in-1 corrosion inhibitor and wetting agent
  • Reduces the coolant’s surface tension
  • Maintains the cooling system
  • Allows heat to radiate from the vehicle more easily
  • Reduces hot spots in the engine and cylinder heads
  • Reduces coolant temperature by up to 22℉
  • Improves engine power
Specification
  • Brand Royal Purple
  • Model ROY01600
  • Weight 14.1 ounces

EVANS have earned a second spot on our list, with this water-free engine coolant. Specifically designed for ATVs, UTVs, trail bikes, and motocross bikes, it’s the perfect solution whatever vehicle you drive. The water-free formula practically eliminates corrosion, along with pump cavitation. This adds up to a coolant that helps keep your engine running smoothly for years to come. It can also have a surprising impact on the vehicle’s fuel efficiency, helping you save money on gas. Race teams have depended on EVANS for years, to protect their engines from the strenuous conditions of the track. The coolant has an impressively high boiling point of 375 degrees Fahrenheit, so there’s no risk of boil over, even in hot conditions. Without vapor in the cooling system, you can avoid a swathe of engine problems. Drivers agree that this coolant does an excellent job preventing your bike from overheating, whatever the weather.

Key Features
  • Water-free engine coolants, suitable for motorcycles, UTVs, ATVs, trail bikes, and more
  • Water-free formula keeps corrosion at bay
  • Helps prevent pump cavitation
  • Improves engine efficiency
  • Protects engines during strenuous race conditions
  • High boiling point of 375℉
  • Resistant to vaporizing
Specification
  • Brand EVANS
  • Model EC72064
  • Weight 4.85 pounds

The second coolant additive to make our list is by Motul. The handy formula is specially designed to reduce your engine’s temperature by as much as 30 degrees Fahrenheit. It works by improving the coolant’s heat exchanging capabilities, making for a more efficient exchange in the radiator. The additive also protects against corrosion in aluminum, magnesium, cast iron, copper, brass, and bronze cases. On top of this, the blend is friendly to plastic, seals, and rubber pipes, managing to avoid cavitation over a broad range of temperatures. Overall, it significantly improves the engine’s cooling capabilities, keeping things at the perfect temperature for efficient driving. Adding Motul’s solution to your vehicle’s coolant can significantly reduce the risk of pre-ignition, knocking, and cooling system issues, keeping the engine running smoothly for longer. This improves efficiency can also save you money on fuel and repairs.

Key Features
  • Coolant additive (does not contain antifreeze ingredients)
  • Reduces an engine’s running temperature by up to 30℉
  • Protects against corrosion
  • Suitable for aluminum, magnesium, cast iron, copper, brass, and bronze cases
  • Won’t corrode plastic or rubber
  • Keeps engines at the perfect temperature for maximum efficiency
  • Saves fuel and maintenance costs
Specification
  • Brand Motul
  • Model MTL102222
  • Weight 1.15 pounds

Motorex have also earned themselves a spot on our list, with this ready to use coolant. Its ethylene glycol-based formula works to provide excellent protection against not just cold temperatures, but also corrosion, limescale deposits and overheating. The versatile blend is suitable for use with all modern engines but works best with aluminum engines – especially those operating under a high load. For this reason, it’s a great racing coolant, capable of maintaining a stable temperature even in tough conditions. For ease of use, the formula has already been diluted with water, so it’s ready to go straight away. Free from the silicates, nitrates, amines, and phosphates used by earlier coolants, it’s designed to have an impressively long service life. As well as an effective coolant, the mixture also works as a great antifreeze, protecting the engine at temperatures as low as -28 degrees Fahrenheit.

Key Features
  • Ready to use, water-based coolant
  • Ethylene glycol formula protects against corrosion, limescale, and overheating
  • Suitable for use with any modern engine
  • Work especially well with aluminum engines under a high load
  • Protects the engine from freezing at temperatures as low as -28℉
  • Free from silicates, nitrates, amines, and phosphates
  • Excellent service life
Specification
  • Brand Motorex
  • Model TRTC7887
  • Weight 4.8 ounces

Last, but not least, Red Line’s ‘Super Cool’ coolant has earned our final spot. Blended with their patented ‘water wetter’, this high-performance coolant is the perfect fit for motorcycles, ATVs, karts, and more. The ready to go formula is simple to use — just pour and go for great, consistent results. Each batch has been blended with pure, de-ionized water, to prevent corrosion before it can do any damage to your cooling system. Thanks to the addition of corrosion inhibitors and lubricants, the versatile solution also helps to clean and lubricate pump seals, keeping them in great condition while you drive. In use, it significantly reduces the formation of bubbles and vapor, reducing the coolant’s average temperature by up to 20 degrees Fahrenheit. Unlike other coolants on the market, it’s made without glycol compounds. During testing, this innovative formula was found to be more effective when it comes to heat transfer, keeping engines at an optimum temperature like never before. Designed for use with all modern engines, the coolant is a great fit for cast iron, aluminum, copper, brass, and bronze cooling systems.

Key Features
  • Ready to use, water based coolant
  • Suitable for all modern motorcycles, ATVs, karts, etc.
  • Made with de-ionized water for corrosion resistance
  • Cleans and lubricates pump seals in use
  • Reduces the coolant’s average temperature by up to 20℉
  • Free from glycol compounds – new formula improves heat transfer
  • Suitable for use with aluminum, copper, cast iron, brass, and bronze cooling systems
Specification
  • Brand Red Line
  • Model 5824051094
  • Weight 4.15 pounds

Best Motorcycle Coolant Buying Guide

These coolants and additives are the best of the bunch, and we’re confident you’ll find the perfect option for your bike somewhere on our list. To help you make an informed decision, we’ve compiled this brief guide. Below, we run through what to look out for in a motorcycle coolant, the different types you can choose from, and how you can maintain it.

What to Look for in The Best Coolant for Motorcycles

When it’s time to choose a coolant for your motorcycle, keep your eyes open for the following:

  • Ready Mixed

Although it’s not essential to purchase ready mixed coolant, it can certainly make your life a lot easier. If you’re buying a water-based coolant, ready mixed options are generally best because they tend to use non-ionized water. Unlike the tap water you’d have at home, this water is free from the minerals that can cause corrosion and limescale in the cooling system.

  • Long Service Life

We all want to get our money’s worth when it comes to maintaining our bikes – one simple way to do this is by selecting a coolant that’s designed to last. Not only will choosing a quality coolant save you money on top-ups, it can also improve the vehicle’s fuel efficiency, and prevent an array of mechanical issues.

  • High Boiling Point

Coolants with a high boiling point do a much better job of channeling heat away from the engine. For this reason, it’s important to look out for a formula with a high boiling point – at least 250 degrees Fahrenheit.

  • Antifreeze Protection

Most modern coolants are designed to protect your engine whatever the weather. They achieve this through the inclusion of antifreeze ingredients. Look out of a coolant that can protect your engine at cool temperatures, ideally around -24 degrees Fahrenheit or colder.

  • Corrosion Resistance

Without anti-corrosion additives, coolants can slowly cause deterioration inside the cooling system. To help prevent this, look out for a coolant that’s formulated to reduce corrosion. Silicates, phosphates, borates, and more recently carboxylates, are typical corrosion inhibitors to keep your eyes open for.

Motorcycle

Different Motorcycle Coolant Types

You may have noticed from our list that motorcycle coolants come in two main categories:

  • Water-Based

As the name suggests, water based coolants contain water – about 50% of their total volume comprises water, in fact. Some water based coolants can be purchased ready mixed, while others may require you to add water yourself. Water based coolants are the most common type, and tend to be a lot more cost-effective than their waterless counterparts. They’re also more commonly used. However, these coolants tend to have a lower boiling point, and may not be suitable for extreme applications, such as the race track. Water can also be corrosive to the cooling system is it contains certain minerals.

  • Water Free

This type of coolant does not contain water. Although it’s more expensive to purchase, this composition virtually eliminates the issue of corrosion in your car’s cooling system. The chemicals used in these coolants also have a higher heat capacity and boiling point than water, allowing heat to be channeled away from the engine more efficiently. This greater effectiveness makes waterless coolants ideal for the harsh conditions of the race or rally track. Water free coolants also tend to last for longer than water based solutions.

Average Operating Temperatures

Average engine temperatures will vary from vehicle to vehicle. In a typical modern car, this temperature should be in the range of 194 degrees Fahrenheit.

Some diesel powered vehicles will run safely at higher temperatures from 210 – 220 degrees Fahrenheit.

Whatever your vehicle’s optimum operating temperature, a high quality coolant will help to maintain it, improving power and efficiency.

Best Motorcycle Coolant FAQ:

Q: What is a motorcycle coolant?

Motorcycle coolant is a liquid used to keep the engine of your vehicle at a safe temperature. When engines burn fuel, energy is released, but only about a third of this energy actually moves the vehicle forward – the rest is lost as heat. For this reason, it’s easy for the engine block to overheat without a cooling system in place. In this system, engine coolant is circulated from the engine block to a radiator on the outside of the vehicle. The coolant absorbs heat from the engine, and becomes cooled as the vehicle moves, before being pumped back to the engine once again. Most coolants are water based, since water has a relatively high heat capacity. The coolant will also contain antifreeze and anti-corrosion agents, to help prevent it from freezing in the winter, or damaging the radiator and other cooling system components.

Q: How often should I change my coolant?

Engine coolant deteriorates over time, through chemical processes such as aluminum corrosion, and acidification. These changes make the liquid less effective at carrying heat away from the engine, and could cause damage to the cooling system. For this reason, it’s important to have your coolant changed every two years, even if you haven’t covered many miles. Motorcycle driver riding on motorway

Q: How do I dispose of old radiator fluid?

Many types of coolant contain highly toxic ingredients. For example, ethylene glycol is highly poisonous to humans. For this reason, it’s vital that you dispose of old coolant responsibly:
– Ensure the engine is cool
– Drain the fluid by unscrewing the sealing screw beneath the engine coolant tank
– Direct the old fluid into a large plastic bottle or bucket using tubing and a funnel
– When all the fluid has been expelled, remove the tubing and seal the bottle
– Sterilize the funnel and tubing you used thoroughly
– Never pour the old fluid down a drain, skin or toilet
– Label the bottle with its contents (ie. ‘Used coolant’) and mark it as ‘dangerous’
– Contact your local government office, or a knowledgeable garage to find a safe disposal or recycling facility

Our Top Pick

In our opinion, the best option on the market right now is this Honda motorcycle coolant. Specially designed to work with all Honda and Acura vehicles, it’s a versatile solution that lasts and lasts. Each batch arrives ready mixed, and ready to use. Made with de-ionized water, it won’t form scale in your coolant system, helping to ensure a consistent performance for years to come.

The silicate-free formula will keep performing well for up to five years, making it excellent value for money. Drivers across the board noted that this reliable coolant worked perfectly, was easy to use, and proved to be a highly cost effective way to maintain a functioning engine.

Sources:

  1. How to Properly Dispose of Old Radiator Fluid – Do it Yourself
  2. How to change your coolant –  Motorcycle News

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