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

🔥Boiling point 325°C / 617°F

🚗Universal fit for all hydraulic systems

⚙️100% Synthetic, Non-silicone

31967CFA

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Description

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

TRUSTED BY PROS - Ranked #15 in Automotive Oils with a stellar 4.8-star rating from 1,647 enthusiasts.
PURE SYNTHETIC FORMULA - 100% synthetic, non-silicone fluid delivers superior resistance to moisture and degradation.
LIGHTWEIGHT EFFICIENT - Compact 500ml bottle weighing just 110g, perfect for quick top-ups and maintenance.
UNIVERSAL COMPATIBILITY - Engineered to fit all hydraulic brake and clutch systems for seamless integration.
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 100% synthetic, non-silicone racing brake fluid designed for hydraulic brake and clutch systems. It boasts an exceptionally high boiling point of 325°C (617°F) for extreme thermal resistance and stability, ensuring peak performance under demanding conditions. Universally compatible and highly rated, this 500ml bottle is a must-have for professional-grade vehicle maintenance.

Specifications

ASIN	B004LF1U5O
Automotive Fit Type	Universal Fit
Best Sellers Rank	#803 in Automotive ( See Top 100 in Automotive ) #15 in Automotive Oils
Brand Name	Motul
Compatible with Vehicle Type	Car
Container Type	Bottle
Customer Reviews	4.8 4.8 out of 5 stars (1,647)
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
Manufacturer	Motul
Manufacturer Part Number	101667
Model Number	MTL101667
Number of Packs	1
SAE J300 Viscosity Grade	10W
UPC	782645025470 182682992405
Unit Count	16.9 Milliliters

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