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 RBF 660 Racing Brake Fluid – DOT 4, 100% Synthetic Racing Brake Fluid - 500ml Bottle (101667)

Motul RBF 660 Racing Brake Fluid – DOT 4, 100% Synthetic Racing Brake Fluid - 500ml Bottle (101667)

Product ID: 6731267

Details

Brand
Motul
Liquid Volume
500
Package Information
Bottle
Vehicle Service Type
Car Truck ATV
Viscosity
1.5-2.5 at 100

🔥204°C flash point - extreme heat resistance

⚙️100% synthetic formula - peak performance

🏎️1.5-2.5 cSt viscosity @100°C - precision braking

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Details

Brand
Motul
Liquid Volume
500
Package Information
Bottle

Description

🏁 Stop faster, ride harder, and own the road with Motul’s ultimate racing brake fluid.

PURE SYNTHETIC POWER - 100% synthetic formula ensures superior fluid integrity and longevity for all hydraulic brake and clutch systems.
UNIVERSAL COMPATIBILITY - Engineered for cars, trucks, motorcycles, and ATVs—one fluid to rule them all.
PRECISION VISCOSITY CONTROL - Optimized 1.5-2.5 centistokes viscosity at 100°C delivers flawless brake response and pedal feel.
RACE READY THERMAL STABILITY - Withstands extreme heat up to 204°C for consistent stopping power under pressure.
TRUSTED BY PROS ENTHUSIASTS - Top-rated with 4.7 stars and rave reviews from stunt riders and racers alike—don’t get left behind.

Motul 101667 RBF 660 is a 500 ml bottle of 100% synthetic DOT-4 racing brake fluid designed for hydraulic brake and clutch systems. It offers extreme thermal resistance with a flash point of 204°C and a viscosity range of 1.5-2.5 cSt at 100°C, ensuring reliable, high-performance braking across cars, motorcycles, trucks, and ATVs. Highly rated by users for durability and stopping power, it’s the go-to choice for professionals and enthusiasts seeking uncompromised control and safety.

Specifications

ASIN	B004LF1U5O
Automotive Fit Type	Universal Fit
Best Sellers Rank	#47,473 in Automotive ( See Top 100 in Automotive ) #34 in Brake Fluids
Brand	Motul
Brand Name	Motul
Compatible with Vehicle Type	Car, Truck, Motorcycle, ATV, etc.
Container Type	Bottle
Customer Reviews	4.7 out of 5 stars 1,594 Reviews
Flash Point	204 Degrees Celsius
Global Trade Identification Number	00182682992405, 03374650020501, 03374650235011
Included Components	Motul 101667 RBF 660 Dot-4 100 Percent Synthetic Racing Brake Fluid - 500 ml
Item Type Name	Motul 101667 RBF 660 Dot-4 100 Percent Synthetic Racing Brake Fluid - 500 ml
Item Weight	110 Grams
Liquid Volume	500 Milliliters
Manufacturer	Motul
Manufacturer Part Number	101666
Manufacturer Warranty Description	Motul 101667 RBF 660 Factory Line Dot-4 100 Percent Synthetic Racing Brake Fluid - 500 ml
Model Number	MTL101667
Package Information	Bottle
SAE J300 Viscosity Grade	10W
Size	500 Milliliter
UPC	782645025470 182682992405
Unit Count	16.9 Fluid Ounces
Vehicle Service Type	Car, Truck, Motorcycle, ATV, etc.

Reviews

T**Y

17.10.2025

T**L

24.02.2026

T**N

12.11.2025

A**S

31.10.2025

A**R

1.08.2018

A**R

29.07.2023

D**L

20.02.2026

J**R

29.01.2025

K**.

15.10.2025

A**R

8.07.2025

S**M

10.01.2024

R**O

15.10.2025

M**R

9.05.2022

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