Motul RBF 600 Vs 660: Which Is Best In 2023?

Motul RBF 600 and RBF 660 are two of the most popular brake fluids on the market for racing and high-performance applications.

However, they have some differences that set them apart from each other.

In this blog post, we’ll be comparing RBF 600 and RBF 660 and highlighting the differences between them.

We’ll be discussing the wet and dry boiling points, viscosity, and price of both brake fluids, so you can determine which one will work best for your specific needs.

Whether you’re a professional race car driver or an enthusiast who wants the best for your high-performance vehicle, we’re here to provide you with the information you need to make an informed decision.

Quick Comparison

Wet Boiling Point: RBF 660 has a higher wet boiling point than RBF 600, meaning it is more resistant to moisture absorption.

Dry Boiling Point: RBF 660 has a higher dry boiling point than RBF 600, making it more suitable for racing and high-performance applications.

Viscosity: RBF 660 has a lower viscosity than RBF 600, which means it flows more easily through the brake lines and provides a more responsive brake pedal feel.

Motul 660 Vs RBF 600 Racing Brake Fluid

Brake fluids are usually made from glycol that is hygroscopic. Thus these can effectively absorb moisture when exposed despite being just in the air.

However the brake system is a sealed system, but moisture can still make its way through hoses and seals.

If it happened after a long time, brake fluid will help absorb moisture and water down them.

At the same time, it degrades the performance or capabilities. Water also helps lower the boiling point to make the fluid work, even in a less effective situation when the car or bike warms up.

So both of the brake fluids will be a great option for any rider who is riding or driving more extremely.

However, if you compare, both come with a higher dry and wet boiling point so that you can ensure the braking is performing ideally rather than being abused.

Besides, these are glycol-based brake fluids, and their rating easily surpasses Dot 5 silicone or 5.1 non-silicones.

Even, both are equally reliable and come from the same brand. So Motul 600 and 660 are close brothers and if you ever use Motul 600, then the 660 will feel similar.

However, 660 brake fluids are designed amazingly which makes them more acceptable for extreme applications.

If you consider the popularity, then the Motul 600 will come first as it has already worked great and made a position among a range of options.

Apart from the similarities, let’s discuss some differences between these two brake fluids so you can choose the better one according to your needs.

Purpose

Comparing both the brake fluids, likewise other aspects these are both used for cars and motorbikes.

These are made for all types of hydraulic actuated brake and clutch system which needs synthetic racing brake fluid.

But if you need some extra performance you should go for Motul 600 brake fluids. It greatly helps prevent vapor lock and brake fade during hard use.

So if you have a racing bike or car and want to enjoy extreme performance, Motul 600 brake fluids will allow you to do so.

Rating

Moving to the brake fluid types, these Motul 600 vs 660 both are DOT 4 type brake fluid as you can see on the name tag and bottle.

Besides, DOT 4 is currently the most used grade. If you don’t know about the grade, let me clear to you that there are DOT 3, 4, 5, and 5.1 available in the market.

Among them, DOT 3, 4, and 5.1 types are similar to each other as they are made from glycol and allow mixing together if needed.

Apart from these Motul 600 comes in a bit higher advantage. It is designed in such a way that exceeds both DOT 3 and DOT 4 specifications.

Boiling Temperature

Another key difference between these two brake fluids is their boiling temperature.

However both of them are made of the same substance, but they aren’t the same because of their boiling temperature.

Racing brake fluid should have the ability to take the heat generated from many braking.

In this case, 600 fluids can make the job done before reaching boiling point at 312 degrees Celsius.

Especially the feature makes it much better than DOT 5.1 non-silicone-based brake fluid.

Conversely, 660 brake fluids are even better if you compare them with 600 fluids as it is rated to boil at 325 degree Celsius or 617 degrees Fahrenheit.

However both of the brake fluid promotes effective brake in extreme conditions and reduce air entrance for brake cooling, but 660 brake fluids will be better because of their slightly higher performance.

Performance

Undoubtedly both of the brake fluids surpassed the higher-rated fluid test easily.

Even after deeply comparing both of them, there weren’t any differences found in regular aggressive driving or riding.

So it is a bit difficult to choose one while both of them provide the same performance in practice.

Price

Finally, you can consider something that can easily help you choose the one that is your budget.

However both of them are pretty same in the class of purpose, performance, rating, and temperature, but the price makes the biggest difference between Motul RBF Motul 600 vs 660.

While Motul 660 is available at an inexpensive price, Motul 600 will cost you twice if you compare it with 660 fluids.

However, price is not the only factor to judge the quality it will help you make a decision based on your budget.

Final Words

After comparing Motul RBF 600 and 660, it can be concluded that both brake fluids are excellent choices for high-performance vehicles.

However, there are some key differences between the two that may make one more suitable for a specific application.

Motul RBF 600 is a DOT 4 brake fluid that offers exceptional performance under extreme temperatures and high-pressure conditions.

It has a high boiling point of 312°C (594°F) and a wet boiling point of 216°C (421°F), making it an ideal choice for track use.

Motul RBF 660, on the other hand, is a racing brake fluid that is specifically designed for the most demanding motorsports applications.

It has a higher boiling point than RBF 600, with a dry boiling point of 327°C (621°F) and a wet boiling point of 204°C (399°F). This makes it an excellent choice for high-speed racing and other extreme conditions.

In summary, if you are looking for a high-performance brake fluid for occasional track use or spirited driving, Motul RBF 600 is an excellent choice. If you are a serious racer or have a high-performance vehicle that sees frequent track use, Motul RBF 660 is the ideal brake fluid to ensure maximum performance and safety.