Will it mix with the non synthetic fluid?

According to the Motul documentation: "Avoid mixing with polyglycols based brake fluid with lower performances. Do not mix with silicone (DOT 5 silicone base) or mineral base fluids (LHM)."

Can you use this on 04 subaru wrx as the amazon fitment is saying no?

All Brake Fluid, including Motul 660, is a universal fluid that can be used in any motor vehicle's hydraulic brake system, including a Subaru WRX. However, Motul 660 is a much more expensive high temperature brake fluid designed for racing car applications on the race track where the brakes can glow red hot and regular specification brake fluid would boil and the brakes would fade. Unless you are racing your car or using the brakes really hard in repeated applications, you will not need such a higher specification and cost brake fluid like Motul 660.

Is it normal that its a little darker (darker shade of yellow)? Just used it to flush and replace oil fluid

It will be darker when you flush brake system as it is mixing with the old brake fluid during the system bleed process.

What is the date format printed on the bottle and is this a manufacturing date or expiration date?

Hi Robby, Usually for the oil there is no expiration unless it is having contact with the air. As the brake fluid is hydroscopic, if you keep the bottle in cool, dry well ventilated place it should be good for a few years. The date is manufacturing date printed. Motul can answer better about it. Regards. Team 2to4wheels

Rbf 660 Factory Line Dot 4 100 Percent Synthetic Racing

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Description

🔥 Stop at nothing with Motul RBF 660 – where street meets track performance!

PURE SYNTHETIC POWER - 100% synthetic, non-silicone fluid engineered for peak performance and longevity.
UNIVERSAL COMPATIBILITY - Seamlessly fits all hydraulic brake and clutch systems for hassle-free upgrades.
PRECISION FLUID DYNAMICS - Optimized viscosity (1.5-2.5 cSt at 100°C) for smooth, responsive braking.
TRACK TESTED RELIABILITY - Preferred by racers and street drivers alike for superior stopping power and safety.
RACE PROVEN THERMAL STABILITY - Withstands extreme heat up to 325°C, ensuring no fade under pressure.

Motul RBF 660 Factory Line is a 100% synthetic DOT-4 racing brake fluid designed for hydraulic brake and clutch systems. It boasts an exceptionally high boiling point of 325°C (617°F) for extreme thermal resistance and stability, ensuring superior braking performance under intense conditions. Its universal fit and non-silicone formula make it a top choice for both professional racers and performance-driven street vehicles.

Specifications

ASIN	B004LF1U5O
ASIN	B004LF1U5O
Automotive Fit Type	Universal Fit
Best Sellers Rank	#619 in Automotive ( See Top 100 in Automotive ) #9 in Automotive Oils
Brand Name	Motul
Compatible with Vehicle Type	Car
Container Type	Bottle
Country of Publication	France
Country of origin	France
Customer Reviews	4.8 4.8 out of 5 stars (1,582)
Customer reviews	4.8 4.8 out of 5 stars (1,582)
Date First Available	7 June 2019
Flash Point	204 Degrees Celsius
Global Trade Identification Number	00182682992405, 03374650020501, 03374650235011
Included Components	Motul 101667 RBF 660 Dot-4 Racing Brake Fluid 500 mL
Is Discontinued By Manufacturer	Yes
Item Type Name	Motul 101667 RBF 660 Dot-4 Racing Brake Fluid 500 mL
Item Weight	110 Grams
Item model number	MTL101667
Liquid Volume	500 Milliliters
Manufacturer	Motul
Manufacturer	Motul
Manufacturer Part Number	101666
Model Number	MTL101667
SAE J300 Viscosity Grade	10W
UPC	782645025470 182682992405
Unit Count	16.9 Milliliters

Reviews

S**M

The best

I replaced the OE brake fluid in my Kia Stinger with the Motul RBF 660. It's probably mainly made for the track, but I'm using it on the street. The OE brake fluid quickly boiled, so I needed something with a higher boiling point.

10.01.2024

A**S

Great package, as advertised

This is higher rated for race purposes, which means it works better than OE dot4, but also means it needs more frequent replacement as it absorbs more moisture.

4.10.2022

K**.

On time delivery. Works as advertised.

15.10.2025

A**R

Good, fluid is fully sealed and I recieved one thats relatively recently manufactured (06/2024) works well for track use.

8.07.2025

R**O

El mejor líquido de frenos, muy bueno

15.10.2025

M**R

زيت كويس جدا

9.05.2022

I**G

Overkill for a road bike but why not?

28.03.2026

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