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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🔥 Push Limits, Not Your Brakes! 🏁

AERODYNAMIC EDGE - Enhances brake response for smoother, faster stops that keep you ahead on the track.
PURE SYNTHETIC POWER - 100% silicone-free synthetic fluid engineered for precision and longevity in hydraulic systems.
LIGHTWEIGHT COMPACT - 500ml bottle with a sleek design, perfect for quick refills and race-day readiness.
UNIVERSAL COMPATIBILITY - Seamlessly fits all hydraulic brake and clutch systems—no compromises, just performance.
RACE READY THERMAL STABILITY - Withstands extreme heat up to 325°C for unbeatable brake performance under pressure.

MotulRBF 660 Factory Line Dot-4 is a 100% synthetic, silicone-free racing brake fluid designed for hydraulic brake and clutch systems. It boasts an extreme thermal resistance with a very high boiling point of 325°C (617°F), ensuring superior performance and stability under intense racing conditions. The universal fit and aerodynamic benefits make it the go-to choice for professional and enthusiast racers seeking reliable, high-performance braking.

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Manufacturer	Motul
Part number	101667
Item Weight	110 g
Product Dimensions	8.38 x 18.42 x 5.46 cm; 110 g
Item model number	MTL101667
Size	0
Color	Gray
Material	Silicone
Item thickness	7.5 Inches
Volume	500 Milliliters
Item Package Quantity	1
Speed Rating	Other
Specific uses	High-Performance Braking, Racing Applications
Included components	Motul 101667 RBF 660 Dot-4 Racing Brake Fluid 500 mL
Batteries Included?	No
Batteries Required?	No

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

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