<div dir="ltr">I change oil at 5K miles or at 12 months and use synthetic oil. Probably overkill for many of my engines, however.<div><br></div><div>Regarding oil setting in an unused engine, I believe that synthetic oil setting in an unused engine probably would not noticeably deteriorate for periods longer than 12 months. </div><div><br></div><div>I know many folks who put synthetic oil in air-cooled motorcycles and only ride a few hundred miles a year. When draining that oil, it looks pretty much the same as it did when it was poured into the engine. I believe that it probably could be used for longer than 12 months in that specific scenario.<div><br></div><div>I think the 12 month change interval for low mileage engines is mostly important for engines that routinely see short trips, do not reach operating temperatures,and may have condensation build-up in the sump. It probably also is more important for non-sealed crankcases in humid environments where moisture from humidity could condense. </div><div><br></div><div>Moisture also is of course a byproduct of combustion, and if the engine does not reach and run at normal operating temperatures for sustained periods of time, moisture is likely to remain in the crankcase and contaminate the oil. </div></div><div><br></div><div>I do not believe, however, that simply having oil in the sealed sump of an unused engine would need to be changed every 12 months from being in contact with the metal or other materials inside the engine.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Aug 29, 2022 at 6:56 PM Tom Coradeschi <<a href="mailto:tjcora@icloud.com">tjcora@icloud.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"><div dir="auto">The contaminants will cause the oil to degrade, hence the need to change it on either time or mileage, per the OEM spec (whichever comes first).<br><br><div dir="ltr">Tom Coradeschi<div><a href="mailto:Tjcora@icloud.com" target="_blank">Tjcora@icloud.com</a></div></div><div dir="ltr"><br><blockquote type="cite">On Aug 29, 2022, at 1:44 PM, Gene Garrison <<a href="mailto:gene@garrison-grafixx.com" target="_blank">gene@garrison-grafixx.com</a>> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">
<p>I'm glad you brought that up. I've always wondered about
changing oil.</p>
<p>So oil sitting in bottles on the shelf doesn't "go bad". Right?</p>
<p>Then why does oil sitting in a rarely used engine need to be
changed? I know it now has contaminants and such in it, but those
aren't going to cause it to degrade, are they?</p>
<p>- GeneG<br>
</p>
<div>On 8/29/22 03:59, Jeff Scarbrough
wrote:<br>
</div>
<blockquote type="cite">
<div dir="auto">I just replaced a set of trailer tires that had
less than 2500 miles on them because they were ten years old and
definitely showing it.
<div dir="auto"><br>
</div>
<div dir="auto">I consider tires to be like oil - they should be
changed at a mileage or time interval, whichever comes first.
It's just something you have to budget for.</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, Aug 29, 2022, 02:04
Bob Spidell <<a href="mailto:bspidell@comcast.net" target="_blank">bspidell@comcast.net</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">
<div> re: "How many years can a set of tires go ..."<br>
<br>
Subject to debate, and how the tires are maintained.
Some--often people who make and sell tires--insist six years
is the limit, regardless of mileage, and if the tires are
constantly exposed to extreme weather and mileage that's not
unreasonable. OTOH, if the tires are kept in a garage not
subject to temperature extremes and are only used 'around
town' you can usually go more, 7 or 8 years wouldn't be too
risky. At any rate, going beyond 10 years is pushing your
luck.<br>
<br>
BUT ... for an SUV I'd be more cautious and probably observe
the 6-year 'rule.' SUVs and other trucks are top heavy and a
catastrophic failure--i.e. a blowout--esp. on a front tire
can cause the vehicle to roll over. Ford just got slapped
with a $1B+ liability charge for an old truck that had a
blowout, rolled, and the cab squashed the elderly occupants.
A couple decades ago Ford got slammed when some incorrect,
improperly inflated Firestone tires--Ford and Firestone go
WAY back--caused some fatal rollover accidents with some
Explorers.<br>
<br>
My rule of thumb: If I find myself worrying about my tires,
it's time for new. Your tires are only three years (+/-) old
and, unless they're showing 'checking'--cracking--or other
damage they should be good for at least a couple more years.
Check your tire pressures regularly (at least once a month).<br>
<br>
<br>
<br>
<div>On 8/28/2022 9:19 PM, Shannah Miller wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div>Thank you, Ian, for commenting to the group. I
will</div>
<div>need tires at some point, and that's good to know.</div>
<div><br>
</div>
<div>That said, my car is the spare car of the family,
and</div>
<div>has had the same tires since 2019. How many years</div>
<div>can a set of tires go if they are just mostly used
to</div>
<div>putt around town? (My car has not quite 10,000
miles</div>
<div>on it.)<br>
</div>
<div><br>
</div>
<div>Thanks,</div>
<div>Shannah<br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sun, Aug 28, 2022
at 7:20 PM Ian McFetridge <<a href="mailto:shop-talk2@mcfetridge.org" rel="noreferrer" target="_blank">shop-talk2@mcfetridge.org</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">
<div dir="auto">I have had the Michelin Defender LTX
on my pickup since fall 2020 and they are wearing
well, ride smooth and quiet. I’ve used Michelins on
trucks since I worked in the tire dept at Sam’s in
college. They always took the least amount of
weights to balance and had the least returns for
issues or to rebalance. The manager at Costco said
that is all still true when I bought the last set.
YMMV :)</div>
<div dir="auto"><br>
</div>
<div dir="auto">Best </div>
<div dir="auto">Ian</div>
<div><br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sun, Aug 28,
2022 at 8:03 PM john niolon <<a href="mailto:jniolon@att.net" rel="noreferrer" target="_blank">jniolon@att.net</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">
<div>
<div><font face="Segoe UI">shop content... I
drive my suburban into my shop</font></div>
<div> </div>
<div><font face="Segoe UI">time for tires...
always used Michelin for the last 20 years
with good service... Vehicle is 2008
Suburban 1500 with 95% highway or town
...no off road</font></div>
<div><font face="Segoe UI">occasional towing
my hobby truck to shows on 20' car hauler
(once or twice a year with load equalizing
hitch...) Looking at reviews on my first
choice Michelin Defender LTX/MS</font></div>
<div><font face="Segoe UI">275/55-20. The
reviews talk a lot about road noise and
rough ride..... My current Michelin
Defenders (bought in Jan 2016 ride smooth
and wear well.. 76K miles on them so far)</font></div>
<div> </div>
<div><font face="Segoe UI">I just turned 75
and this might be my last set of tires <img alt="Grinning Face with Smiling Eyes" style="width: 24px; max-width: 100%; background-color: rgba(0, 0, 0, 0); border-color: rgb(255, 255, 255); color: rgb(255, 255, 255);" align="absMiddle"> …
so I'm looking for your thoughts on
Michelin or others afa mileage, ride,
noise etc.</font></div>
<div> </div>
<div><font face="Segoe UI">thanks</font></div>
<div><font face="Segoe UI">john</font></div>
</div>
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