Synthetic can damage some OEM seals so you need to take care. If in
doubt, when rebuilding the system, soak a seal in the fluid you intend
to use for 24 hours and see if any swelling takes place.
I switched to synthetic in my 82 911 Porsche and the rear seals swelled
to the point that the brakes stayed on and ground up the pads and disk
in a few thousand miles.
Rebuilt everything with the above in mind and 10 years later all is ok.
If a little regular fluid is left in the line it does not hurt the
change, although it is best to blow everything out and get it all clean.
I have even used synthetic as a "cap" on regular fluid in the master
cylinder to form a moisture barrier. The synthetic floats on the
regular fluid and is moisture proof, this protecting the system from
absorbing fluid.
Cheers,
Larry Dent
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