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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101667 RBF 660 Dot-4 100 Percent Synthetic Racing Brake Fluid - 500 ml

101667 RBF 660 Dot-4 100 Percent Synthetic Racing Brake Fluid - 500 ml

Product ID: 6731267

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Details

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

🔥204°C flash point - extreme heat resistance

⚙️1.5-2.5 cSt viscosity @ 100°C - precision fluidity

🏎️100% synthetic - pro-grade racing performance

Description

🏁 Stop faster, drive harder — race-grade brake fluid for the driven professional.

PRECISION VISCOSITY CONTROL - Optimized 1.5-2.5 centistokes viscosity ensures flawless hydraulic response.
UNIVERSAL FIT FOR ALL RIDES - Compatible with cars, trucks, motorcycles, and ATVs—one fluid to rule them all.
RACE READY THERMAL STABILITY - Withstands extreme heat up to 204°C for consistent braking under pressure.
MANUFACTURER RECOMMENDED EXCELLENCE - Engineered to meet OEM specs for trusted, race-inspired stopping power.
SYNTHETIC FORMULA FOR PEAK PERFORMANCE - 100% synthetic composition delivers superior brake feel and reliability.

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, trucks, motorcycles, and ATVs. Perfect for professionals seeking OEM-level quality and race-inspired stopping power.

Specifications

Viscosity	1.5-2.5 centistokes at 100 degrees Celsius
Brand	Motul
Vehicle Service Type	Car, Truck, Motorcycle, ATV, etc.
Flash Point	204 Degrees Celsius
UPC	782645025470 182682992405
Automotive Fit Type	Universal Fit
Global Trade Identification Number	00182682992405, 03374650020501, 03374650235011
Manufacturer	Motul
Size	500 Milliliter
Model	101667
Item Weight	3.88 ounces
Product Dimensions	3.3 x 7.25 x 2.15 inches
Item model number	MTL101667
Is Discontinued By Manufacturer	Yes
Manufacturer Part Number	101666
OEM Part Number	101667-A038

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