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There are testers for this; I suspect they are a type of litmus pager we all
remember from high school chemistry class (NFI, no experience with them):
http://tinyurl.com/qz2p5zr
----- Original Message -----
..as a final thought.. though there are now "permanent" coolants
available for new vehicles, our old cast iron engines still require
glycol based coolant. As a rule of thumb for exchange/life duration...
stick your finger in the coolant, if it still feels slippery then it's
likely still OK for a while longer.. best guess/test from me..
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<html><body><div style=3D"font-family: Arial; font-size: 12pt; color: #0000=
00"><div>There are testers for this; I suspect they are a type of litmus pa=
ger we all remember from high school chemistry class (NFI, no experience wi=
th them):<br></div><div><br></div><div><b>http://tinyurl.com/qz2p5zr</b></d=
iv><div><br></div><hr id=3D"zwchr"><div style=3D"color:#000;font-weight:nor=
mal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans=
-serif;font-size:12pt;"><br><div><br></div>..as a final thought.. though th=
ere are now "permanent" coolants <br>available for new vehicles, our old ca=
st iron engines still require <br>glycol based coolant. As a rule of thumb =
for exchange/life duration... <br>stick your finger in the coolant, if it s=
till feels slippery then it's <br>likely still OK for a while longer.. best=
guess/test from me..<br><div><br></div><br style=3D"color:#000;font-weight=
:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,=
sans-serif;font-size:12pt;"></div></div></body></html>
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