If the switch to silicone is made in a system that has had DOT 3 or DOT
4, it must be flushed completely and all the seals replaced. It seems
that, while silicone and DOT 3 & 4 are not incompatible, if one is put
in a system in which the other type has resided and been absorbed by the
seals, there is a problem of desorbtion of the one and absorbtion of the
other, leading to the seals swelling. If the system is well flushed and
new seals installed, there is no problem. I have been using silicone in
my TD for the past 20 years and have never changed it at all during that
time. Not only have I had no problems, but when I checked the fluid
recently, it was still as crystal clear as the day I put it in. With no
moisture absorbtion, there is no corrosion in the system.
I checked with the local NAPA store and they said that they do not carry
Castrol GTLMA. Another, locally owned store still carries it, so I
believe it is still out there, just takes some looking.
Good luck,
Dave
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