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 Factory Line Dot-4 100 Percent Synthetic Racing Brake Fluid 500ml (101667)

Motul RBF 660 Factory Line Dot-4 100 Percent Synthetic Racing Brake Fluid 500ml (101667)

Product ID: 261480895

Details

Brand
Motul
Liquid volume
500
Package information
Bottle
SAE J300 Viscosity Grade
10W
Vehicle service type
Car

🌍Universal fit for all hydraulic brake/clutch systems

🔥Boiling point 325°C / 617°F

⚙️100% synthetic, non-silicone formula

¥9082

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Description

🔥 Stop on a dime, race every time! ⚙️

TRUSTED BY PROS - Motul’s Factory Line quality, ranked #17 in Automotive Oils, trusted by 1,660+ enthusiasts with a 4.8-star rating.
PURE SYNTHETIC POWER - 100% synthetic, non-silicone formula delivers superior fluidity and longevity for your brake system.
LIGHTWEIGHT EFFICIENT - Compact 500ml bottle weighing just 110g, perfect for quick maintenance without bulk.
UNIVERSAL COMPATIBILITY - Engineered to fit all hydraulic brake and clutch systems, making upgrades effortless.
RACE READY THERMAL STABILITY - Withstands extreme heat up to 325°C, ensuring consistent braking performance under pressure.

Motul RBF 660 Factory Line Dot-4 is a premium 100% synthetic racing brake fluid designed for hydraulic brake and clutch systems. Featuring an extreme thermal resistance with a boiling point of 325°C (617°F), it ensures optimal braking performance under high stress. Its universal fit and non-silicone formula make it a top choice for professional and enthusiast drivers seeking reliability and superior fluid dynamics.

Specifications

ASIN	B004LF1U5O
Automotive Fit Type	Universal Fit
Best Sellers Rank	#1,987 in Automotive ( See Top 100 in Automotive ) #50 in Automotive Oils
Brand	Motul
Brand Name	Motul
Compatible with Vehicle Type	Car
Container Type	Bottle
Country of Publication	France
Customer Reviews	4.8 out of 5 stars 1,673 Reviews
Flash Point	204 Degrees Celsius
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
Item Type Name	Motul 101667 RBF 660 Dot-4 Racing Brake Fluid 500 mL
Item Weight	110 Grams
Liquid Volume	500 Milliliters
Liquid volume	500 Milliliters
Manufacturer	Motul
Manufacturer Part Number	101667
Model Number	MTL101667
Number of Packs	1
Package information	Bottle
SAE J300 Viscosity Grade	10W
UPC	782645025470 182682992405
Unit Count	16.9 Milliliters
Vehicle service type	Car

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

H**I

لم يتم إرجاع مبلغ الثلاث عبوات المسترجعه لحد اللحظه !!!!

10.07.2026

M**K

Recomiendo

Calidad

1.08.2026

A**R

The good stuff

Holds up well for repeated track days, working hard, as expected. Can't go wrong.

11.05.2026

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

D**L

Top

22.05.2026

M**R

جيد جدا

زيت كويس جدا

9.05.2022

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¥9082

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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