| 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?
Marks 3
1966 BJ8
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