technology | February 19, 2026

Can you mix Motul RBF 600 and 660?

Can you mix Motul RBF 600 and 660?

They are both DOT-4 fluids, and from the same manufacturer, so they should be safe to mix. Obviously to get the full benefit of the 660’s higher dry boiling temp’ you should do a full flush and bleed. 1 of 1 found this helpful.

Is Motul brake fluid worth it?

Our pick for the best brake fluid is the Motul Dot-4 100 Percent Synthetic Racing Brake Fluid. While it’s slightly pricier than other brands, it improves pedal feel, protects against water penetration, and increases performance for both daily drivers and racers.

Which brake fluid should I use?

By far, DOT 3 is the most popular. It’s been in use for a very long time. Fresh DOT 3 has a boiling point of 401 degrees Fahrenheit, fully degraded it drops to 284 degrees Fahrenheit. This makes your brake fluid much more likely to boil.

How long does Motul 660 last?

As long as you do not break the inner seal on the bottle it will last on the shelf no problem. Once you open brake fluid i should be used in 6 months or be recycled.

Does amsoil make brake fluid?

AMSOIL DOT 3 & 4 Synthetic Brake Fluid maintains maximum ABS and traction-control performance. Brake fluid acts as a hydraulic fluid, transferring power and lubricating brake system components while also preventing corrosion.

What type of brake fluid does a BMW use?

All modern BMWs use DOT-4 brake fluid. Sometimes it is hard to find, or you will only find DOT-3/DOT-4 synthetic.

What year did Harley start using DOT 5 brake fluid?

1976
DOT 5 brake fluid is stipulated for nearly all motorcycles from Harley-Davidson and Buell roughly from model years 1976 to 2004/2005 with original braking systems.

Should I use dot3 or 4?

The primary differences between the two include the following: DOT 3 brake fluid will absorb less water than DOT 4 from the air over time, meaning you’ll need to have your fluid changed less frequently. DOT 4 brake fluid has higher dry and wet boiling points, making it safer for higher temperatures.

Can I use dot3 instead of DOT 4?

Yes, DOT 3 brake fluid is compatible with DOT 4 brake fluid. However, DOT 4 offers a higher boiling point. DOT 5.1 is used in high-performance and heavy-duty applications due to its high boiling point. It’s compatible with DOT 3 and DOT 4 fluid.

What is DOT 5.1 brake fluid?

BRAKE FLUID DOT 5.1 is a brake fluid for hydraulic brake and clutch systems with a boiling point of at least 260 °C and an extremely high wet boiling point of at least 180 °C. Because of the low viscosity at low temperatures, particularly suitable for additional systems, such as ABS and ASR.

Can I use DOT 3 brake fluid in my Harley?

Harley-Davidson used DOT 5 until a decade ago but specifies DOT 4 now that all their bikes have ABS. Okay, back to the common glycol-based fluids then. DOT 3 fluid has the lowest minimum dry boiling temperature at 401 degrees dry and 284 degrees wet, while DOT 5.1 has the highest at 518 degrees and 356 degrees wet.