Motul 600 Vs. 660 – In-depth Comparison

High-performance cars, such as racecars, have immense demands that you should meet for the best driving experience. For consumables like brake fluid, you must choose prime selections ideal for extreme conditions, like Motul 600 or 660.

As a high-performance vehicle owner or enthusiast, there is a high chance you have encountered the Motul 600 vs. 660 dilemma. We will give our take on this topic to help you determine the suitable brake fluid between the two.

motul rbf 600 vs 660

Motul 600 Overview

Motul 600 is a top-grade brake fluid perfect for your racecar’s braking system. This hydraulic fluid has numerous appealing elements that make it fit for extreme driving, notably its high boiling points. It has a dry boiling point of around 594 degrees Fahrenheit and a wet boiling point of 401 degrees Fahrenheit.

Racecars and similar automobiles generate high temperatures when on the road or track. Motul 600’s high boiling points ensure stability and efficiency under these extreme temperatures. Additionally, there is a reduced chance of brake fade, which results from overheated braking fluid and may lead to unresponsive braking.

Motul 600 brake fluid flows smoothly when temperatures drop; thus, it is perfect for winter driving. It is a long-lasting utility with a service life of between 18 and 24 months. This brake fluid is a DOT 4 fluid, which is glycol-based with hygroscopic properties. You should keep it in an airtight container to prevent water contamination.

You can get an excellent offer by getting the Motul 600 Factory line synthetic racing braking fluid, which comes in a pack of four.

Motul 660 Overview

Motul 660is an amber-colored braking fluid with a dry boiling point of 617 degrees Fahrenheit and a wet boiling point of 401 degrees Fahrenheit. These high values are responsible for its suitability in extreme performances, as it will remain stable with temperature increase.

This Motul brake fluid is a DOT 4 and is hygroscopic. For its longevity, you should tightly seal it to avoid water contamination, which lowers its effectiveness. Despite its hygroscopic nature, it can serve you up to 12 months.

Buy the Motul 660 DOT 4 100% synthetic racing brake fluid for improved racecar performance.

Motul 600 Vs. 660: Differences

Motul 600 and 660 are ideal for extreme applications, like in racecars, which explains their RBF tag, which means racing brake fluid. A comparison of the two brake fluids will reveal their differences, which is crucial in picking the best. The following elements highlight their variations.

Boiling Point

As previously hinted, performance-oriented cars generate much heat when driven and need brake fluids to withstand the temperature hike. It calls for brake fluid with high boiling points, like Motul 600 and 660, with dry boiling points of 594- and 617 degrees Fahrenheit, respectively. They have the same wet boiling point of 401 degrees Fahrenheit.

Motul 660, with a higher dry boiling point, is better for extreme driving, as it is more resilient against temperature hikes. Go for the 660 if you intend on pushing your supercar to its maximum limits, with minimal chances of brake fade.

What about Motul 700? On the Motul 600 vs. 660 vs. 700 comparisons, the 700 has a higher dry boiling point of 637 degrees Fahrenheit; it is the best for vehicles that generate a lot of heat.  


Viscosity is a crucial factor to consider when picking an ideal braking fluid. You weigh viscosity against temperature to hint at the fluid’s performance. Motul RBF 660 is denser than 600, and temperature variations don’t affect it much. The density gives it an edge in performance and is less prone to leaking. Nevertheless, it is poor in heat dissipation.

Motul 600’s low viscosity is handy in low temperatures. Its kinematic viscosity is 1750 mm2/s at -40 degrees Fahrenheit, meaning it flows better than Motul 660, whose kinematic viscosity is 1698 mm2/s at the same temperature. The low density also makes it slightly better at heat dissipation.

Regarding the Motul 600 vs. 660 viscosity discussion, the latter is perfect for resiliency in high temperatures. Motul 600 is great if you want balanced protection without losing much on the preferred boiling point values.


Motul RBF 600 and 660 are synthetic brake fluids built for hydraulic brake and clutch systems of high-performance cars. They have high boiling points, which support their extreme functionality.

On application, Motul 660 is the victor in high temperatures, courtesy of its high boiling point and viscosity that ensure its stability. Motul 600’s lower density allows it to flow effortlessly in low temperatures, giving it an edge of adaptability.

The two brake fluids are versatile, and apart from performance-oriented cars, they are compatible with marine and motorcycle braking units. You may also use them on conventional hydraulic brakes and clutches.


Both Motul 600 and 660 primarily come in 500ml bottles. Motul 660 is typically pricier than its counterpart, possibly due to its excellent functionality in high temperatures. The cost of the two Motul products varies depending on the dealer.

Fluid Change Intervals

Hydraulic fluids with longer change intervals and economical, as you spend less on replacements. Motul 600 is more durable, with a service life of 18-24 months, while Motul 660 requires a swap roughly every 12 months.

Please note that these Motul products are glycol-based and are highly hygroscopic. This attribute can lower their service life, as they absorb water from the environment, which affects their efficiency. You should store the fluids in tightly-sealed containers to prevent water contamination.

Use a brake fluid tester to check the moisture and mineral content of brake fluid to determine its usability.

Below is a comparison of the technical aspects of the two Motul brake fluids.

Aspect Motul 600 Motul 660
Color Amber Amber
Product category DOT 4 brake fluid DOT 4 brake fluid
Dry boiling point 594 degrees Fahrenheit 617 degrees Fahrenheit
Wet boiling point 401 degrees Fahrenheit 401 degrees Fahrenheit
Viscosity at 212 degrees Fahrenheit 2.5 mm2/s 2.6 mm2/s
Viscosity at -40 degrees Fahrenheit 1750 mm2/s 1700 mm2/s


Can I Mix Motul 600 With 660?

Motul 600 and 660 are both Motul DOT 4 brake fluids. It is safe to mix them to take advantage of their respective perks, such as Motul 660’s higher boiling point, though it will be to a lesser degree. A braking fluid flush is necessary before swapping the fluid.

While you can mix the two, Motul’s product data sheet advices against it. If possible, you should stick to the product recommended by your car’s manufacturer.

What Is the Best Brake Fluid for Racing?

Racing is demanding and requires high-grade utilities. The perfect brake fluid for racing must have a high boiling point and viscosity to withstand the extreme driving conditions characterized by excess heat production.

Motul 600 and 660 are top contenders for the best brake fluid due to their high boiling points. Motul 700 outdoes the two, courtesy of its higher boiling point.

What Does RBF Mean in Brake Fluid?

When purchasing brake fluid, you might encounter various technical information on their packages that indicate their designation. The RBF tag in brake fluid is an abbreviation of racing brake fluid, meaning the product’s target is racecars and other extreme-performance vehicles.

Such brake fluids have high boiling points to meet their functionality. The high values translate to resiliency when temperatures rise, typical with such driving conditions.

What Is the Boiling Point of Motul 700?

Motul 700 is a superior braking fluid for high-performance vehicles, with its high boiling points being responsible for its efficiency. Its dry boiling point is 637 degrees Fahrenheit, while its wet boiling point is 401 degrees Fahrenheit.

Why Is Motul Better?

Motul is a French multinational that specializes in motor fluids and coolants. Several things make it a suitable partner to many motorists, particularly its high-quality products. Motul’s car consumables won’t disappoint you, courtesy of the firm’s quality control processes.

Motul’s massive product catalog comprises transmission fluids, brake fluids, greases, motor oil, additives, and many more. They fall under the passenger car, heavy-duty, and power sport product categories. It means it has something for the different vehicle needs.

Motul has a global presence, and its products are easily accessible in different parts of the world.

What Makes Motul Special?

Motul is a reputable company specializing in top-grade automotive utilities, mainly fluids. It is firmly committed to innovation and research and seeks to improve the quality of its products regularly. Besides product quality, Motul’s large and loyal customer base comes from its brand prestige, as it has been operational for almost two centuries.

Another thing that makes Motul special is its broad consumables catalog. Under its product collection, you find transmission fluids, motor lubricants, hydraulic fluids, brake fluids, coolants, and more. The company also has utilities for performance and commercial cars.

Motul is a global brand and is present in most countries worldwide. Additionally, it has in place environmental conservation measures. Its products are eco-friendly and less harmful to the surroundings.

Final Words

The Motul 600 vs. 660 discussion explores two high-quality brake fluids built for extreme driving. We determine that 660 is more efficient than 600, owing to its higher boiling points that translate to resiliency against the hiked temperatures. Motul 600 is excellent in cold temperatures, having a better flow than its counterpart.

The best pick between the two depends on your driving conditions. If your vehicle emits a lot of heat, the 660 is better, while the 600 is perfect if you drive in cooler environments. Also, note that the 600 is cheaper than the 660.

Both are long-lasting brake fluids but remember to check their state regularly, especially if you drive in harsher environments.


Hi there, I am R. Hasan Tito, a mechanic, and owner of this website. My friend and I created this website to share our knowledge, expertise, and experience with our fellow mechanics' community and car users. I am a specialist and certified automotive mechanic (Both Heavy Commercial and Private Cars). I worked as a Mechanic and Mechanic Supervisor for over fifteen years at Global Rebound Automotive companies - Toyota, TATA, BMW, Nissan, TVs, and Others. Now, I enjoy my new role of leading a team of automotive experts (in their respective fields) and publish new content on a regular basis on my website and social media.

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