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Old 04-06-2001, 06:01 PM   #1
Void
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Member#: 5540
Join Date: Apr 2001
Post "Clutch Fluid"

My car: 98 RS
My question: Are there any negatives to replacing the standard Subaru DOT 3 "clutch fluid" (brake fluid really) with DOT 4? My fluid seems to be overheating during drives of any length and the pedal looses all resistace. The guys at my service department said this was the only possible problem/fix, but they werent sure the stock clutch is able to "accept" anything besides the standard fluid. Maybe a dumb question, but I wanted to make sure. Thanks
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Old 04-06-2001, 06:05 PM   #2
tom@kartboy
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that was one of the first things i did to my car. i changed all the fluids to some good Motul dot 4 fluid
tom@kartboy.com
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Old 04-06-2001, 06:06 PM   #3
Tobias_Ostapchuk
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...My 1998 RS used to do the same thing on warm and humid days. I solved the problem very easily. I purchased a WRX.

(I had TOO MANY problems with the RS!)
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Old 04-06-2001, 06:08 PM   #4
Bottom Feeder
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Where the heck did you go to get this diagnosis? I can't imagine what toture you would have to inflict onto your car in order to overheat the clutch fluid. I've heard of racebikes boiling brake fluid, but a car overheating clutch fluid... geezus.
Get a second opinion somewhere else.
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Old 04-06-2001, 08:36 PM   #5
gaylemd
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2001 2.5 RS
BRP

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Go ahead and change it to DOT 4. The manual says you can use either or.

Mike
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Old 04-06-2001, 11:13 PM   #6
cvalle-sd
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I did the same as Kartboy I noticed when my clutch pedal got all "funny" Disengaging only at the furthers travel of the pedal, low pedal position, sticking, etc. I put in the Motul and prob Solved.
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Old 04-07-2001, 04:53 AM   #7
EchoWrx
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White

Lightbulb

Yes, Use DOT4 synth-brake fluid and read this...
http://www.i-club.com/ubb-files/Foru...ML/000238.html

Good Luck
Gill
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Old 04-07-2001, 03:17 PM   #8
CUNNINGHAM
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It is not a good idea to change to DOT 4 because the seals in the clutch resivior and in the slave cylinder are not compatiable with the DOT 4 fluid. The seals will swell over time and begin to leak.
I have never heard of clutch fluid getting hot enough to fail.
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Old 04-07-2001, 06:58 PM   #9
superstring
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Talking

Hey Void!

I'm trying to sort the same problem with my car (98 RS). Funny thing is that I'm on my fifth clutch (warranty replacement to try and cure shudder) and the first three shuddered but didn't have the problem under discussion. #4 - no shudder but....

I'm tuned in with interest!!
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Old 04-08-2001, 04:04 AM   #10
EchoWrx
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Angry

CUNNINGHAM IS WRONG!!!
In my 2000rs manual page 10-29 it says use dot 3 or DOT 4! The only time when you can't use dot 3 or 4 is when you use silicone DOT 5 brake fluid. Call a dealer or any dealership for any car and ask. Synthetic fluid DOT 4 will not boil as fast and will not cause harm to the seals.
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Old 04-08-2001, 04:42 AM   #11
tmat3
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/|\
|
|

This dude is correct. You can use DOT3 or DOT4 fluid for brake or clutch. I have used Valvoline DOT4 synthetics many times in different vehicles.

You cannot use DOT5. That's only for Corvettes and other fast cars (I think).
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Old 04-09-2001, 12:51 AM   #12
Wheels
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Replace the gearbox fluid and the rear diff fluid to synthetic. I`ve never had a problem with over heating but I have had a problem with hard gear changes in winter and really sloppy ones in summer.
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