simnova6

hey guys I'm planning on doing some early maintenance on my slave cylinder to prolong its life. Just curious what would be the best clutch fluid to use thanks for any input

MacofTampa

Castrol SRF, its expensive so it must be good! It has very high boiling temp ratings and is comparable with both DOT 3 & 4 brake fluids specifications...Mac

TXGS507

Running the Motul....

Schred86

Amsoil dot4

Tech

Wilwood EXP 600 Plus

Larry Myers

The only thing important when servicing clutch fluid is that it's DOT4.

The brand is not important when used in the clutch hydraulic system.

Some time back GM issued a bulletin advising that because of numerous clutch master cylinder failures it would provide an improved version. This guidance was applicable to certain model year vehicles.

The replacement component can be identified by a black reservoir and DOT4 on the reservoir cap.

Several lengthy threads covering this issue on this forum.

I understand you didn't ask about the clutch master cylinder but thought it might be helpful to ensure the health of your hydraulic system.

Tech

I agree with this for a stock vehicle but the Wilwood EXP 600 Plus fluid I suggested helped me when I had a high RPM shifting issue. My car was modified including aftermarket exhaust (more heat transferring to clutch line) and clutch (throw could be different based upon diaphragm spring).

TXGS507

I too am experiencing this... high RPM from 3rd to 4th the clutch acts "lazy" for lack of a better term. It doesn't slip, smell, or stick to the floor.. But it does act lazy @ those higher RPM shifts.

Someone told me I should insulate the MC cable due to the heat from the long tubes. they also suggested to change to Motul... Which I did. I still experience it from time to time. Mine is the OEM Master from the factory.

Mordeth

Motul 600 here for the clutch. For street/garage queen Prestone DOT 4 also works perfectly fine.

simnova6

Wow. Everybody uses a different one lol. Interesting

Gary '09 C6

I use Prestone DOT 4 in both the clutch and brake systems.

Car is not regularly tracked, except at the Texas Mile (2012--2016). I plan to return to the Mile later this year.

BearZ06

Prestone DOT 4 here too.

REDZED2

TXGS507

What do you agree with Derek?

BAAD LS2

SRF is the best.

rabrooks

SRF is crazy overkill. Who needs 600 degree boiling point in a clutch system. And at $75 per quart. ouch

Any good DOT 4 is all the clutch system needs (Penzoil)

I have SRF in the brake system but only cause its a track car

MacofTampa

OP asked for the "best"

Tech

Larry Myers

I agree.

Clutch hydraulics operate at a much lower temperature than brakes. Therefore, in my experience, exotic fluid is not required.

In my clutch I use AC Delco fluid. Only because the Vette tech. at the dealer gave me several cans. In the 13 years I've driven the car the clutch has been flawless. This includes about 65,000 street/track miles and 50/60 track days.

Good clutch maintenance involves using DOT4 fluid, keeping said fluid clean and installing the improved master cylinder.

Brakes, of course, a completely different matter.

The bottom line is if one gets a warm fuzzy using hi. temp. fluid in their clutch, go for it. Just one of the choices we make as with tires, engine oil, brake pads, ect.

REDZED2

HAHA Matt

Dat Prestooooone DawT fior. GREET 4 my moter tuuu.