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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🏁 Dominate the track with brake fluid engineered for champions!

SYNTHETIC PURITY - 100% synthetic formula ensures consistent, high-performance braking without silicone contamination.
MINIMIZED AIR INTRUSION - Optimized to reduce air intake during brake cooling, enhancing aerodynamic efficiency.
UNIVERSAL COMPATIBILITY - Perfect for hydraulic brake and clutch systems, including carbon, ceramic, and steel discs.
SUPERIOR WET PERFORMANCE - Maintains braking power in rain with a 205°C wet boiling point, beating standard fluids.
RACE PROVEN THERMAL STABILITY - Withstands blistering 325°C boiling point for unbeatable brake reliability under extreme heat.

Motul 847205 RBF 660 Factory Line is a 100% synthetic DOT 4 racing brake fluid designed for hydraulic brake and clutch systems. It boasts an exceptional dry boiling point of 325°C and a wet boiling point of 205°C, outperforming conventional DOT 3, 4, and 5.1 fluids. Engineered to resist extreme temperatures from carbon and ceramic brakes, it minimizes air intrusion for better brake cooling and aerodynamic performance, ensuring reliable braking even in the harshest racing conditions.

Reviews

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**R

Normal

23.05.2025

A**R

It's not worth and there is no expiry date on it too, I don't want to ruin my bike

They have send 6 years old product

9.07.2025

M**H

Selling Expired Brake Fluid

The RBF 660 they are selling is of 2017 vintage. Unopened racing brake fluid has a shelf life of three years. They should be dumping, not selling this product!

13.10.2022

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Package Information	Bottle
Liquid Volume	500 Millilitres
Item Weight	110 Grams
Recommended Uses For Product	cars
Item Form	Oil
Global Trade Identification Number	00182682992405, 03374650020501, 03374650235011
Net Quantity	500.0 millilitre
UPC	782645025470 182682992405
Product Dimensions	8.38 x 18.42 x 5.46 cm; 110 g
Item model number	MTL101667
Manufacturer Part Number	101667
OEM Part Number	101667-A038
Volume	0.5 Cubic Inches
Assembly Required	No
Item Weight	110 g

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

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