<div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">As for synthetic oil, my understanding is that seal materials were updated around 1980 to be compatible with synthetics. That means original seals in our tractors are probably not. The failure mode is seal swelling, which can deform the seal enough to cause a leak. Any seal replaced in the last couple of decades should be no problem.</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">Chris</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Dec 13, 2019 at 5:45 PM Chris Zach <<a href="mailto:cz@alembic.crystel.com">cz@alembic.crystel.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">While drilling out the steering cotter pin, I noticed that my E20 <br>
transmission had leaked all over the driveway. Nice little puddle, turns <br>
out the drain plug was not on tightly enough. I cranked it down harder <br>
but should I put teflon tape around the threads or something?<br>
<br>
I hate synthetic oil.<br>
<br>
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