Motul 600 Vs 660 – Which Of These Brake Fluids Is For You?

Choosing the right brake fluid can make all the difference in maximizing your engine’s performance and longevity.

When it comes to high-performance synthetic fluids, two of the most popular options are Motul 600 and Motul 660. So, which one is better: Motul 600 vs 660?

While both are designed to provide excellent protection and lubrication, they have some key differences that could impact your choice.

Let’s explore the differences between these two products to help you decide which is best for your vehicle.

About Motul 600

motul 600 vs 660
Motul 600

Motul 600 is a synthetic braking fluid known for its exceptional performance in high-stress and high-heat conditions.

This product is a popular choice among professional endurance race drivers and car enthusiasts to flush their brake fluid for the best possible performance from their engines.

The key feature of Motul 600 is its superior heat resistance, which is achieved by using advanced synthetic technology and a high-temperature synthetic base fluid.

This allows the fluid to maintain its viscosity and lubricating properties even under extreme temperatures, preventing engine wear and prolonging brake life.

In addition to heat resistance, this brake liquid product provides excellent wear protection for critical engine components, such as the camshaft and piston rings.

The unique formulation of the oil includes a blend of additives that work together to reduce friction, resist oxidation, and improve fuel economy.

About Motul 660

Motul 660 is a high-performance synthetic brake fluid designed for racing and other high-stress applications.

It is formulated with a blend of advanced synthetic base fluids and a specialized additive package that provides exceptional heat resistance and wear protection.

The unique chemistry of Motul 660 allows it to maintain its viscosity and lubricating properties even under extreme temperatures, which can prevent engine wear and extend engine life.

The product is also engineered to reduce friction and improve fuel economy, which can help improve engine performance and efficiency.

Another key feature of Motul 660 is its excellent resistance to shearing, which can help prevent fluid breakdown and prolong ít life.

Additionally, the brake fluid is compatible with a wide range of engines and is suitable for use in both gasoline and diesel engines.

What Are The Differences Between Motul 600 Vs 660?

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Differences Between Motul 600 Vs 660

Motul 600 delivers better performance with a lower viscosity and lasts longer than the other. But the Motul 660 will be cheaper and have a greater boiling temperature.

In general, Motul 600 and 660 are both high-performance synthetic brake fluids designed for racing and high-stress applications.

While the two products share some similarities, they still have several key differences as below:


While comparing the two brake fluids, it is also important to note that both high-performance cars and motorcycles use these.

They are designed to work with any hydraulically operated brake or clutch system that requires synthetic race fluid.

But Motul 600 is a better choice if you require more performance. When used vigorously, it considerably aids in preventing brake fade and vapor lock.

Hence, Motul 600 will enable you to enjoy extraordinary performance whether you own a racing motorcycle or car.


A fluid’s viscosity is almost as crucial as the boiling point. Viscosity serves as a gauge for how liquid braking fluid is in comparison to standard brake fluid.

Although a thicker fluid is more resistant to temperature changes, it may also be less efficient in transferring heat.

Compared to the Motul brake fluid RBF 600, the Motul RBF660 offers a higher viscosity, making it thicker and less susceptible to temperature changes.

It does, however, become significantly less efficient at transporting heat away from the car’s brakes as a result.

Boiling Temperature

The boiling point drop of these Motul brake fluid products also makes a significant difference.

Although they are both composed of the same material, their boiling points make them different according to the brake fluid boiling point chart.

The heat produced by repeated braking should not be a problem for racing brake fluid.

In this instance, 600 fluids will be sufficient to complete the task before the solution reaches boiling point at 312°C.

It is significantly superior to DOT 5.1 non-silicone-based brake fluid, especially the feature. In contrast, 660 braking oils are superior to 600 fluids since they are rated to boil at 325°C or 617°F.

Although both brake fluids encourage effective braking in hazardous situations and limit air intake for brake cooling, 660 brake fluids are preferable because of their marginally improved performance.


Regarding high-performance brake oils, Motul 600 and Motul 660 are two popular choices among car enthusiasts.

The former is a high-performance brake fluid best suited for aggressive street driving and track use, while the latter is specifically formulated for extreme conditions.

That being said, the tests for the brake fluids easily exceeded those for the higher-rated fluid.

Even after a thorough comparison of the two, regular vigorous riding or driving showed no differences. Hence, choosing one is challenging as they both deliver the same results in practice.

Fluid Replacement Interval

The fluid replacement time between Motul RBF 660 and Motul 600 is the subject of the following important discussion.

The latter should be refilled every 20,000 kilometers (about 12,400 miles) or 24 months for everyday city driving and off-roading.

In contrast, it is advised that Motul RBF 660 be changed after 10,000 kilometers (about 6,200 miles) or a year.

But once you notice the brake fluid color changing, it’s time to replace it with a new one, no matter the mileage.

In conclusion, you should choose which one is better for your brakes based on how you use it and where you park your car.


Finally, it would be best if you thought about anything that will make it simple to select the option that fits your budget.

Although both fall into the same general category of function, rating, temperature, and performance, the cost is what separates Motul RBF 600 from 660.

When you compare these two fluids, Motul 660 is the more affordable option.

Although it will assist you in making an excellent choice based on your budget, pricing is not the only way to evaluate quality.

Final Verdict

The best fluid out of these two is quite difficult to choose.

Both fluids can provide superior braking performance and consistency under extreme conditions, making them widely regarded as top-performing fluids.

From our ATE brake fluid comparison, the choice between Motul 600 and 660 will depend on your specific needs and application.

Go for Motul RBF 600 if you want a product that can withstand high pressure.

But the 660 can be a better option for getting your brake system more compatible or precise or for demanding motorsports.

Also, before choosing which brake fluid to use in your car, it is always advisable to seek advice from a skilled mechanic or the manufacturer’s instructions.

Frequently Asked Questions

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Question Of Motul 600 Vs 660

Can I Mix Motul 600 And 660?

Yes. It should be okay to mix them as they are both DOT-4 fluids and come from the same manufacturer. If you don’t understand the DOT of your brake oil, click here.

You should perform a complete flush and bleed in order to fully benefit from the 660’s greater dry boiling temperature.

What Is Special About Motul Brake Fluid?

With its application in its 100% synthetic automobile brake oils, MOTUL was the ester technology’s global pioneer.

The vegetable-derived esters have remarkable anti-shear and anti-high temperature capabilities in addition to their exceptional lubricating qualities.

How Long Can Motul 600 And 660 Last?

Generally, Motul recommends that their oils be used within 5 years from the date of production, as indicated on the packaging.

However, if the fluid has been stored in a cool, dry place and away from direct sunlight and moisture, it may last longer than 5 years.

The Bottom Line

Choosing between Motul 600 vs 660 ultimately comes down to your individual needs and driving style.

If you’re looking for a brake fluid type that can handle high temperatures and extreme stress, Motul 600 is a great choice.

However, suppose you’re pushing your engine to its limits and want the best possible protection; Motul 660 may be the better option.

Whatever you choose, both are excellent synthetic brake oils that help keep your engine running smoothly and efficiently.

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