Clutch Hydraulic Fluid Recommendation?
#2
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I used Valvoline DOT4 Synthetic at one point, but under hard use, it didn't last.
I now have ATE Superblue DOT4 Racing fluid in both the brakes and the clutch, and its been very good.
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I use DOT3 in mine. Whatever advanced auto had, I don't remember the brand. I beat the crap out of my car at the track and have had no issues at all. I do have the tick master with an extra heat sleeve on the line. I would at least put the sleeve on it especially if it's a stock master and line. You can never have enough protection from heat with hydraulic lines.
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#8
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However, DOT3 is not mineral oil. All DOT3/4 fluid is technically "synthetic", which is why it is almost all labeled as such. There is no such thing as DOT3 mineral oil, they are two separate things. Older European cars (Audi, ect.) used to use mineral oil in their hydraulic brake systems, but not any more.
The best thing to use is high temp DOT4 fluid or DOT 5.1 (notice the .1) which is the highest temp formula. As I said, I use Superblue DOT4, and its been excellent. Castrol also makes a high performance brake fluid called SRF, which is rated to an extremely high 590 degrees, but its very cost prohibitive at $80 a quart. Its intended mostly for racing use.
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DOT4 is better than DOT3, and they are 100% compatible with each other. GM just specs out DOT3 because that is the minimum requirement for the system.
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I'm guessing the bottle is labeled as DOT4 brake fluid? I plan on picking some up locally as opposed to going the online route. Living in Canada sucks, we can't take advantage of any free shipping.
#14
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Yes, if you want high temp fluid, go with DOT4. The bottle will be labeled as such, or may say DOT3/4, since it meets both specs. Make sure you go with a brand name such as Prestone or Valvoline as well, never trust store brands.