View Full Version : hydrolic fluid

10-07-2006, 04:22 PM
I seem to remember when I had my TR3 and the other Spit I had to use a different type of fluid. This 71 I'm not sure about. Info would be helpful. Don't want to mess up something that's working so well.

Andrew Mace
10-07-2006, 06:42 PM
I'll assume you mean brake and clutch fluid? Not to worry, as any quality fluid should be ok. The old bit about certain fluids hurting the "natural rubber seals" (or whatever) really doesn't apply any more unless you happen to be using 1950s-vintage NOS rebuild kits for cylinders.

Of course, there are the two main schools of thought as to what to use today: Silicone v. pretty much anything else. Bottom line is that each type has its advantages and disadvantages. I'm strictly a Castrol GT/LMA fan myself (that being the actual successor to the old Castrol-Girling Crimson, Green or Amber flavors over the years).

10-07-2006, 09:55 PM
This is a classic debate. I agree with Andrew. I use Castrol GT LMA, which is a DOT4 fluid. It's rated better than the typical DOT 3 that is commonly used, but is still compatible with it. It is also compatible with the rarely found Natural rubber seals in case you come across old stock british hydraulic.
There's lots more info on hydraulic fluid, but I'll leave that to the others who'll chime in

Geo Hahn
10-07-2006, 10:24 PM
[sound of chimes]...

I, on the other hand, prefer the DOT 5, aka Silicone.

You owe it to yourself to try to see the pros & cons of both types -- but be forewarned, there's a lot of emotion and misinformation out there on this subject.

10-08-2006, 09:53 AM
****, where did I come up with "hydrolic" Senior moment.

10-08-2006, 11:33 AM
I can't disagree with Geo. DOT 5 has many good qualities (won't absorb water, rated for much higher temratures, won't lift paint) but to use DOT5 you need to completely flush the system of DOT 3-or-4. as the silicone is not compatible with the mineral based fluids.
SO if you're just looking to maintain your current system, unchanged, your best bet is DOT 4. most commonly found in the form of Castrol GT LMA (lma stands for low moisture absorbsion).
Otherwise, there's nothing wrong with checking out DOT 5 if you're intrested in converting.

10-08-2006, 12:36 PM

Silicon has its attractions, but unless you're purging the system there's no reason to use just some in your system.

10-09-2006, 12:47 PM
I just got home with a can of DOT 4 clutched in my greasy hand. After reading the DOT5 lable, I settled on the 4. I messed up my TR3 with the wrong fluid at one time. Don't want to go there again.