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

Product ID: 218679910

Details

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

💧Wet boiling point 205°C - superior wet braking

🔥Boiling point 325°C - extreme heat resistance

🏎️Universal fit - racing & street ready

625.10 DT

Duties & taxes included

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Description

🔥 Stop at nothing with Motul RBF 660 – the ultimate brake fluid for champions!

MINIMIZED AIR INTRUSION - Optimized formula reduces air entrance during brake cooling, enhancing aerodynamic efficiency.
UNIVERSAL COMPATIBILITY - Engineered for hydraulic brake and clutch systems, compatible with carbon, ceramic, and steel discs.
EXCEEDS INDUSTRY STANDARDS - Outperforms DOT 3, DOT 4, and DOT 5.1 specs for professional-grade reliability.
RACE PROVEN THERMAL STABILITY - Withstands blistering 325°C boiling point for unbeatable brake performance under extreme heat.
SUPERIOR WET BRAKING CONFIDENCE - High wet boiling point of 205°C ensures reliable stopping power even in heavy rain.

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, surpassing conventional brake fluids to deliver superior performance in extreme heat and wet conditions. Compatible with carbon, ceramic, and steel brake discs, it minimizes air intrusion for enhanced brake cooling and aerodynamic efficiency. Trusted by professionals, it exceeds DOT 3, 4, and 5.1 standards, making it the go-to choice for serious racers and performance enthusiasts.

Specifications

ASIN	B004LF1U5O
Automotive Fit Type	Universal Fit
Best Sellers Rank	#120,136 in Car & Motorbike ( See Top 100 in Car & Motorbike ) #23 in Brake Fluids
Brand Name	Motul
Container Type	Bottle
Country of Origin	USA
Customer Reviews	4.8 4.8 out of 5 stars (1,669)
Flash Point	204 Degrees Celsius
Global Trade Identification Number	00182682992405, 03374650020501, 03374650235011
Item Weight	110 Grams
Liquid Volume	500 Millilitres
Manufacturer Part Number	101667
Model	MTL101667
UPC	782645025470 182682992405
Unit Count	500.0 Milliliters

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