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<p>If you look at Walmart online, they list the RV and Marine
antifreeze with a -50 freeze rating to less than $3 / gallon.
That is a lot cheaper than Sierra. Is says you can use it in
inboard boats, so I would think it would be ok for tractors....<br>
Cecil<br>
</p>
<div class="moz-cite-prefix">On 2/17/2019 2:56 PM,
<a class="moz-txt-link-abbreviated" href="mailto:bloomis@charter.net">bloomis@charter.net</a> wrote:<br>
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<p class="MsoNormal">I’ve heard of Sierra, did not know it was
propylene. Since it is made for automotive use then it
probably has the corrosion inhibitors that Ethelene has. I
would research the effects of propylene on an automotive
coolant system before jumping in. We use propylene by the 55
gallon barrel at work diluted for chilling wine tanks via
ammonia heat exchangers, for those tanks that aren’t directly
ammonia chilled. Has to be dyed, we use red which makes it
pink, so you know if there is a leak. Otherwise it looks like
water. And in a winery where water is always in use you’d
never know. Unless that 10” PVC line splits open, again. Why
moving to stainless on all the mains. Speers strictly
recommends NOT using PVC for glycol lines, tho its pretty
standard in older installations. <o:p></o:p></p>
<p class="MsoNormal">Bradford<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b>From:</b> AT
<a class="moz-txt-link-rfc2396E" href="mailto:at-bounces@lists.antique-tractor.com"><at-bounces@lists.antique-tractor.com></a> <b>On Behalf Of
</b>Brice Adams<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I've used propylene glycol, Sierra, in
all my old tractors for 20+ years without trouble. <o:p></o:p></p>
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<p class="MsoNormal">I think it's about 2X ethylene glycol
in price.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Sun, Feb 17, 2019 at 1:49 PM James
Peck <<a href="mailto:jamesgpeck@hotmail.com"
moz-do-not-send="true">jamesgpeck@hotmail.com</a>>
wrote:<o:p></o:p></p>
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<p class="MsoNormal">US manufacturers are supposed to be
adding denatonium benzoate to ethylene glycol to make it
taste bitter.<br>
<br>
<a href="https://en.wikipedia.org/wiki/Ethylene_glycol"
target="_blank" moz-do-not-send="true">https://en.wikipedia.org/wiki/Ethylene_glycol</a><br>
<br>
The sweet smell is how you know you are leaking coolant.
The additives may affect the smell.<br>
<br>
The oral lethal dose for humans is way more than a taste.<br>
<br>
Propylene glycol is a substitute and antifreeze with it is
available. I do not know the cost difference. Propylene
glycol is also used as a food additive.<br>
<br>
<a href="https://en.wikipedia.org/wiki/Antifreeze"
target="_blank" moz-do-not-send="true">https://en.wikipedia.org/wiki/Antifreeze</a><br>
<br>
I have been buying antifreeze based on price. Maybe I
should change my ways and buy propylene glycol brands.<br>
<br>
Does anyone know of any reason why antifreeze based on
propylene glycol should not be used in older tractors?<br>
<br>
[ John Hall] Agree, stench is added to some pesticides,
why can't it be added to this?<br>
<br>
<br>
<o:p></o:p></p>
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