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<DIV><FONT size=2>Not so, DOT 4 and DOT 5.1 are both compatible with DOT 3 and
you can change the fluid without doing anything else, they are all glycol-based
fluids. Having said that all seals in hydraulic systems are supposed to be
replaced every 3 years or 36k.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>It's DOT5 that is the problem, that is silicone-based and
cannot be mixed with any of the others, you have to go through a several-stage
flushing process to change to that fluid from one of the others. Going
back is even worse.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Originally DOT 5 was introduced because it had a higher
boiling point than DOT 3 or DOT 4. But it cannot be used in ABS systems so
DOT 5.1 was developed which equals it in performance.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>PaulH.</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV style="FONT: 10pt arial">... If you ever used DOT3 you need to
replace every seal in the system.</DIV>
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