Motul RBF 600 VS 660: Details Comparison

If you are looking for the best brake fluid for your car, then you should definitely check out Motul’s two best brake fluids: RBF 600 and RBF 660. Both brake fluids are tremendous and offer excellent performance and protection for your brakes.

Although these fluids have several properties, you should know some critical differences before deciding. In this article, we will discuss the differences between Motul RBF 600 vs. 660 so you can decide which is better. So don’t be late, and let’s dig into the dip:

Motul RBF 600 VS 660

Difference Between Motul RBF 600 Vs. 660

Motul RBF 600 and 660 are the most famous brake fluids on the market. Both brake fluids are high-performance and synthetic in modern hydraulic and clutch systems. But which liquid is better? Check out the difference between Motul RBF 600 Vs. 660 and choose the right one for your vehicle.

Temperature Limit

The Motul RBF 600 has a temperature range of -40 to +300° F, while the Motul RBF 660 has a temperature range of -50 to +350° F.

That means Motul RBF 660 can tolerate high temperatures before breaking down. If you operate in an environment where temperatures regularly exceed 300° F, you can choose 660. It’s because it can prevent your brake fluid from losing its effectiveness.

Boiling Point

There is a big difference in the boiling points of Motul RBF 600 and 660. Actually, Motul RBF 600 boiling point is 315°C or 599°F, and 660 is 350°C or 662°F.

The Motul 660 higher boiling point provides high protection during high-performance applications. In particular, it also helps prevent the fluid from evaporating too quickly. Thus it is increasing its lifespan and decreasing maintenance costs.

Consistency Of Liquids

Consider fluid compatibility when deciding between Motul RBF 600 and Motul RBF 660. In addition, Motul RBF 600 is compatible with organic and inorganic acid-based brake fluids. In contrast, Motul RBF 660 is only compatible with acid-based brake fluids. Brake fluid means you cannot use the latter if you run an inorganic liquid system.

Fluid Replacement Interval

Fluid replacement interval is our main discussion point between both of these fluids. After off-road and City Drive, you must replace Motul 600 fluids every 20,000 km and every 24 months.

In contrast, you should replace your Motul RBF 660 fluid every 12 months or 10,000 km. In short, based on the use and location of your vehicle, you must decide which is perfect for your brakes.


Fluid viscosity is essential, like boiling point. Thickness measures how liquid the brake fluid is compared to regular oil. Yet, the thick fluid can resist the changing of temperatures. But this feature can also make it less effective at transferring heat.

Motul RBF 660 contains higher viscosity than 600, meaning it’s thicker and possibly less affected by temperature variations. However, this makes it less effective at transferring heat away from the brake.

Ultimately, you must choose the best fluid for your vehicle. If you want ultimate protection and long-lasting performance in extreme temperatures, RBF 660 is the best. On the contrary, if you want more balanced protection without sacrificing too much in boiling, choose 600.


Now you can think about the cost. Motul RBF 600 and RBF 660 are available in 1-liter bottles, and the price is similar, between US$12-15. It is mostly a matter of preference when selecting one over the other.

For your DIY vehicle maintenance and care, it’s best to invest in both of these fluids. Remember that both are great options. But you also need to consider their respective limits and how they can affect your vehicle’s performance level.

Motul RBF 600 Vs. 660: Which Is Better?

Motul RBF 600 and 660 are two popular choices when choosing the correct brake fluid for your car. Both are high-performance brake fluids and provide amazing stopping energy and durability. Likewise, you must select the better one between Motul RBF 600 vs. 660.

Therefore, choosing the right one between these two liquids takes a lot of work. Overall, if you find a brake fluid that can tolerate high temperatures, go with Motul RBF 600. Nevertheless, if you want different consistency in your brake system, the 660 might be your best choice.

Motul RBF 600 Vs 700:

Motul RBF 700 especially comes to provide high performance under racing conditions. This high-performance brake fluid can offer ultimate braking power and consistency at extreme temperatures. Still, you can use this fluid in conventional steel discs and clutch systems actuators. Undoubtedly, you can use this fluid in everyday road applications. On the other hand,

Motul RBF 600 is a DOT 4 brake fluid but can exceed DOT 3 standards. You can use these fluids for all braking systems except silicone-based liquids.

In fact, it has a relatively high dry boiling point, and its wet boiling point is also on the high side. In cold conditions, the performance of this fluid is also awe-inspiring due to its high viscosity. Long replacement intervals make it too attractive for customers.

Castrol SRF vs Motul RBF 660

One of the first things recommended is upgrading the brake fluid to prepare the car for the track and HPDE. It’s often recommended to use Castrol SRF or Motul RBF brake fluid. Though both brake fluids can trail and HPDE, are they the same?

Motul RBF 660 has an advantage in a higher dry boiling point. And Castrol SRF has a wet boiling point which accounts for its longevity.

The cost is roughly the same for both. Both are performance fluid, but the choice comes from budget and oil change frequency. Frequent oil changes help you benefit from maximum performance, with intervals getting shorter as you track more frequently. So both of these fluids are the best brake fluid for track days.

ATE Type 200 Vs Motul RBF 600:

The ATE Type 200 and Motul RBF 600 are close in specifications. Both would be fine for the road with proper fluid change intervals. But some people say they get good results with the ATE flavor for street and short-track mountain driving. Motul’s wet BP is better than ATE, negating that it is more hygroscopic.

Replacing the fluid more frequently with Type 200 may best suit your daily driver XC90. Even if you don’t bleed the brakes often, do a partial change with top-end reservoir fluid.

ATE fluid provides a high boiling point and lasts for a longer time. Most importantly, this ATE Type 200 fluid is cheaper than Motul 600. You can use this Motul 600 fluid in your race cars and bikes. Change your fluid every 5 track days for the best performance.

Motul 5.1 Vs RBF 600:

Both the fluid is famous for Motul dot 5.1 and the RBF 600. But for spirited daily driving, which liquid is better at the track a few days a year? Before choosing any fluid, you should know about a good maintenance schedule and performance. Though RBF 60 is a great race fluid, it tends to absorb more water and needs to bleed more often.

With the RBF600, you only need to flush it once a year. With 5.1, you must rinse it every other year like any other DOT 4 brake fluid.

Both will work well for the road; it is better if you track RBF 600, but it absorbs moisture quickly. That’s why you need to replace it at least once a year.

Best Brake Fluid For Track Days

There are so many brake fluids on the market that it’s hard to know which is better. Every track day enthusiast has their preferences and a fluid they stick to. Castrol SRF is one of the best fluids that come out on top. But the price point makes many consider it a cheap brake fluid.

Your driving style and your vehicle’s weight and horsepower all factor in which fluid you should use. Let’s discuss the best brake fluid for track days.

Motul RBF 600 VS 660

ATE Type 200 Brake Fluids

The price of this fluid has risen in recent months, but it remains one of the best-value brake fluids. Fans of the old ATE Super Blue brake fluid will find the same performance from this fluid.

ATE Typ 200’s dry and wet boiling points exceed the standard DOT 4 boiling points of 230°C dry and 155°C wet. This fluid doesn’t work well in high horsepower and heavy vehicles. But it can perform well if you use it on Miatas and BRZ/FRS/86s at the track.

Motul RBF 600 Brake Fluid:

For people who demand a higher-performance brake fluid than ATE Typ 200, Motul’s RBF600 is the best one. Undoubtedly, it costs more than twice as much as ATE fluid. But its wet boiling point of 216°C is excellent and exceeds the minimum Dot 3 dry boiling point.

If you repeatedly use this Motul 600, it will work very well and may last a complete track season. This fluid should be sufficient for maximum track day enthusiasts. Price-point-wise, it’s about 40% more inexpensive than the Castrol SRF, which can be significant savings.

Castrol React SRF Premium Choice Fluid:

The mother of all track day brake fluids is Castrol SRF. Additionally, it offers a fantastic wet boiling point of 270°C. The wet boiling point is the main focus for those fluids whose dry boiling point isn’t sufficient.

A high wet boiling point means without flushing your brakes, you can go to many events, which can be expensive. Hence, you’ll spend another $50-80 for the fluid compared to the time and potential labor cost.

Mainly, if you track your vehicle frequently and drive reasonably aggressively, the SRF is best. For many drivers, cheaper options like the RBF600 or ATE Typ 200 may last you an entire season of use. In this case, the advantages could be more worthwhile.

Read Also: Castrol SRF Vs. Motul 600: Which Is the Best Brake Fluid Brand?

FAQ (Frequently Asked Questions):

Q. Can you mix Motul RBF 600 with 660?

Though they are both dot-4 brake fluids from the same manufacturer, you can mix them safely. It would help if you did a complete flush to benefit from the higher dry boiling temperature of 660.

Q. What is Motul 660 compatible with?

Polyethylene Glycol (polyglycerol) DOT 3, DOT 4, and DOT 5.1 are Compatible with any brake or hydraulic clutch system. Likewise, it’s not compatible with silicone DOT 5 fluid-powered systems. All types of hydraulic brake and clutch lines need non-silicone synthetic fluid.

Q. What is the shelf life of Motul 660?

The minimum shelf life for brake fluid is two years. This does not mean that the product will automatically expire after two years. Shelf life is a significant component of brake fluid and directly impacts braking performance.”

Final Word:

When you have to choose between Motul RBF 600 vs. 660, deciding which option is best is challenging. Notably, though both fluids are best for high-performance cats, they have different vital properties.

This is the article where we compare these two fluids to decide which is best. Hope our small effort will be helpful to you all. Thanks for reading this article attentively.


Causes & Symptoms of Low Brake Fluid In A Car

What Will happen If I Put Brake Fluid In Power Steering


I am Engr. Z Eusuf Lubricant Specialist, Mechanical Engineer & has been working with engine lubricants for a long time and knows what makes them work best. I can help you find the right oil for your needs, and I have tips on how to keep your engine running at its best.