[Healeys] Castrol GT-LMA Brake Fluid

[John Sims]

It is my understanding that all brake fluid is synthetic and has been for a
long time including LMA. Castrol is just apparently using truth in labeling.
You may be cons=fusing DOT 3/4 with DOT 5 which are two different types. DOT
5 is silicone while DOT 3.4 is not.

I believe that other list memembers will state that you have always been
using synthetic fluid even though it was not implicitly stated on the
packaging.

John Sims, BN6
Aberdeen, NJ
 
http://www.healey6.com


-----Original Message-----
From: healeys-bounces at autox.team.net [mailto:healeys-bounces at autox.team.net]
On Behalf Of Mark Schneider
Sent: Friday, May 22, 2009 7:20 PM
To: healeys at autox.team.net
Subject: [Healeys] Castrol GT-LMA Brake Fluid

Listers,

As I began a project of replacing the hydraulic fluid in my Healey
brakes and clutch I found I had one old unopened bottle of Castrol
DOT3/4 brake fluid on the shelf.  I went to the local auto parts store
to buy another bottle or two but found all they had was labelled
"synthetic" . I have not converted my car systems to synthetic brake
fluid as I understood that the synthetic fluids will cause
deterioration of o-rings or any rubber goods in the hydraulic system.
The parts store guy told me that the Castrol synthetic is not silicon
based and is therefore compatible with the older Castrol formulation
and with our old Brit car hydraulic systems.  Can anyone verify this
for me?