What clutch fluid?
Melting Slicks
Joined: Mar 2016
Posts: 2,211
Likes: 237
From: Indianapolis IN
If you are just a casual driver any of the Dot 4 will work. If you are harder on the car you may want something like Motul RBF600 or 660. In a race application you may want to run a Castrol SRF.
Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 413
From: WV
Team Owner
Joined: Mar 2008
Posts: 21,502
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From: Southern Utah
Instructor
Joined: Oct 2016
Posts: 234
Likes: 10
From: Stockholm, Sweden
Would you really gain anything from using a higher quality (read higher boiling point, like RBF600 ) than let's say something like Prestone DOT4? In the brakes I totally get it, since they are under a lot of stress if driven hard.
Does it get that hot? Or is it because of high under hood temperatures? I figure you change fluid (ranger method) once or twice a year anyway since it gets contaminated from the clutch dust if driven hard.
Please enlighten me if I'm on the wrong track, thanks!
Does it get that hot? Or is it because of high under hood temperatures? I figure you change fluid (ranger method) once or twice a year anyway since it gets contaminated from the clutch dust if driven hard.
Please enlighten me if I'm on the wrong track, thanks!
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Melting Slicks
Joined: Mar 2016
Posts: 2,211
Likes: 237
From: Indianapolis IN
For one it is about its hyrdroscopic ability just as much as it is the contamination on clutch dust. A cheap fluid may become more compressible under high temps with much less water absorption to boil. It can also become more abrasive. The temps can reach extremes in drag racing applications. The heat comes from slipping the clutch to achieve a smooth launch. I run Castrol RBF fluid. It is silicone based and will not absorb water whatsoever. This has its pros and cons. The pros are that it will be the same from pull one and cool to the last you make of the night. The down is that when it cools and the heat/water condensed will no mix. It will separate. This can cause a number of issues from cavitation to rust in the lines. Both are bad and it must be changed quite often under heavy abuse.
If my car where more than a garage queen for fun I would run a 600 or 660 motul fluid. It is very forgiving and long lasting. I currently have to change my fluid every set of abuse. I have a remote bleeder with Russel check valves installed so it is much easier than the ranger method.
All in all there is no reason for anyone to run anything better than Prestone Dot 4 in a general street app.
If my car where more than a garage queen for fun I would run a 600 or 660 motul fluid. It is very forgiving and long lasting. I currently have to change my fluid every set of abuse. I have a remote bleeder with Russel check valves installed so it is much easier than the ranger method.
All in all there is no reason for anyone to run anything better than Prestone Dot 4 in a general street app.
Race Director
Joined: May 2007
Posts: 10,805
Likes: 706
From: Feverish All Over
BTW - I have made a habit of "changing" my clutch fluid once a week - but I don't do the whole clutch pumping action x number of times thingy.
I simply remove the fluid in the reservoir with a syringe and replace it with fresh fluid.
I then just drive my car for the week - I figure the normal pumping action of using my clutch over the course of the week amounts to the same as sitting in my driveway and repeatedly pumping the clutch and replacing fluid.
Takes way less time...
I simply remove the fluid in the reservoir with a syringe and replace it with fresh fluid.
I then just drive my car for the week - I figure the normal pumping action of using my clutch over the course of the week amounts to the same as sitting in my driveway and repeatedly pumping the clutch and replacing fluid.
Takes way less time...