Synthetic is fine.
If we were driving a 70s Jaguar, it might be bad.
I hate going to ANY retail stores anymore.

Thanks! I was pretty sure it was fine but being told something like that is Lame


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What ever you do DO NOT mix silicone brake fluid with any other brake fluid. You'll be making jelly.

A lot on here use Motul synthetic, I put in Amsoil synthetic when I installed my new calipers.
There are quite a few good ones.


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Is the oem fluid silicone?


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Thank GOD no. You should use a good DOT4 fluid.

What are some good dot4s that aren't too expensive ?


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Motul 600. That's what most of us use. Check motorcycle shops for it. They might have it cheaper.

Alright thanks!



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Amsoil makes some damn good brake fluid. I run there fluids throughout my Z with the exception of the engine in which I use Redline.

Castrol SRF is my current choice.

See: https://www.castrol.com/en_au/austra...rf-racing.html

Check out the specs there

I've had boiling issues with the silicon fluid. Will never use it again. Motul RBF600 fan here... Highest wet boil point at a reasonable price.

Motul RBF 600 is what I use for my track days and for street duty it holds up very well to high temperatures. Moisture always eventually will build up in your brake fluid over time a good brake fluid flush is always a good idea a specially before your track events.

Castro SRF Racing brake fluid is even better than Motul 600 imho, but it is high dollar stuff. I get a full track season out it and it is just as good for clutch fluid.

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RBF-600 is good - daily and on track run well. I also replaced my clutch fluid with it in an attempt to stretch out my oem clutch slave... the dark fluid over time tells me its going to die a death of a thousand razors anyways.. so be it
Ive got a HS CSC and a new MC ready to drop in when my twin disk goes in ( when the turbos go in :) ) <---rant

Just get a brake fluid tester for 20 bucks to check it periodically...

On track, after rbf600, and carbotech brake pads and some federal 595 rs-rr tires, my weakest link was the "ice-mode" programming trying to kill me (until i figured out how to avoid triggering ice mode)

Daily, you will never know its in there.