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

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Motul 847205 RBF 660 Factory Line Dot-4 100 Percent Synthetic Racing Brake Fluid - 500 ml

Motul 847205 RBF 660 Factory Line Dot-4 100 Percent Synthetic Racing Brake Fluid - 500 ml

Product ID: 736282020

Details

Brand
Motul
Flash Point
204 Degrees
Liquid Volume
500
Package Information
Bottle
UPC
782645025470

🔥Boiling point 325°C / 617°F

⚙️100% synthetic non-silicone formula

🏎️Optimized for racing brake systems

Description

🔥 Push your limits, not your brake fluid!

TRUSTED BY PROS - Rated 4.8 stars by 1,557 users who refuse to compromise on brake fluid quality.
MINIMAL AIR INGRESS - Special design reduces air entry, enhancing brake cooling and aerodynamic efficiency.
PURE SYNTHETIC POWER - Non-silicone formula ensures superior fluid performance and longevity in hydraulic systems.
PRECISION BRAKE CONTROL - Engineered for hydraulic brake and clutch systems demanding peak reliability.
RACE PROVEN THERMAL STABILITY - Withstands extreme heat up to 325°C to keep your brakes responsive under pressure.

Motul RBF 660 Factory Line is a 100% synthetic DOT 4 brake fluid engineered for high-performance racing and hydraulic brake systems. It boasts an exceptional dry boiling point of 325°C (617°F) and wet boiling point of 204°C (400°F), ensuring superior thermal resistance and stability. Designed to minimize air ingress for enhanced brake cooling, this fluid is trusted by professionals and enthusiasts alike for uncompromising safety and performance.

Specifications

ASIN	B004LF1U5O
Brand	Motul
Brand Name	Motul
Container Type	Bottle
Customer Reviews	4.8 out of 5 stars 1,582 Your Review
Flash Point	204 Degrees Celsius
Global Trade Identification Number	00182682992405, 03374650020501, 03374650235011
Item Weight	110 Grams
Liquid Volume	500 Milliliters
Manufacturer	モチュール(Motul)
Manufacturer Part Number	101666
Model Number	MTL101667
Package Information	Bottle
UPC	782645025470 182682992405
Unit Count	500.0 Milliliters

Reviews

K**.

Great Product

15.10.2025

A**R

👍

8.07.2025

S**M

The best

10.01.2024

R**O

Muy buen resultado

El mejor líquido de frenos, muy bueno

15.10.2025

M**R

جيد جدا

زيت كويس جدا

9.05.2022

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