<div dir="ltr">More than just oxygen, the oil is also exposed to the byproducts of combustion - CO, CO2, H2O and more. These byproducts can combine to form acidic contaminants. Fresh oil has additives to combat this but they can't do it forever. <div><br></div><div>EjR </div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Aug 29, 2022 at 4:41 PM <<a href="mailto:eric@megageek.com">eric@megageek.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"><font size="2" face="sans-serif">Gene asks...</font>
<br><font size="2" face="sans-serif">></font><font size="3">Then why does
oil sitting in a rarely used engine need to be changed? </font>
<br>
<br><font size="3">Gene, because in an engine the oil is exposed to oxygen
and other airborne contaminates.</font>
<br><font size="3">In the (unopened) bottle, the oil isn't exposed to air.
 </font>
<br><font size="3"><br>
That is my understanding.</font>
<br>
<br><font size="3">Moose</font>
<br>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr">Eric Russell<div>Mebane, NC</div></div></div>