[Shop-talk] suv tires and oil question

old dirtbeard dirtbeard at gmail.com
Mon Aug 29 21:02:18 MDT 2022 

I change oil at 5K miles or at 12 months and use synthetic oil. Probably
overkill for many of my engines, however.

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.

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.

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.

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.

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.

On Mon, Aug 29, 2022 at 6:56 PM Tom Coradeschi <tjcora at icloud.com> wrote:

> 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).
>
> Tom Coradeschi
> Tjcora at icloud.com
>
> On Aug 29, 2022, at 1:44 PM, Gene Garrison <gene at garrison-grafixx.com>
> wrote:
>
> 
>
> I'm glad you brought that up.  I've always wondered about changing oil.
>
> So oil sitting in bottles on the shelf doesn't "go bad".  Right?
>
> 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?
>
> - GeneG
> On 8/29/22 03:59, Jeff Scarbrough wrote:
>
> 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.
>
> 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.
>
> On Mon, Aug 29, 2022, 02:04 Bob Spidell <bspidell at comcast.net> wrote:
>
>> re: "How many years can a set of tires go ..."
>>
>> 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.
>>
>> 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.
>>
>> 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).
>>
>>
>>
>> On 8/28/2022 9:19 PM, Shannah Miller wrote:
>>
>> Thank you, Ian, for commenting to the group.  I will
>> need tires at some point, and that's good to know.
>>
>> That said, my car is the spare car of the family, and
>> has had the same tires since 2019.  How many years
>> can a set of tires go if they are just mostly used to
>> putt around town?  (My car has not quite 10,000 miles
>> on it.)
>>
>> Thanks,
>> Shannah
>>
>> On Sun, Aug 28, 2022 at 7:20 PM Ian McFetridge <shop-talk2 at mcfetridge.org>
>> wrote:
>>
>>> 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 :)
>>>
>>> Best
>>> Ian
>>>
>>> On Sun, Aug 28, 2022 at 8:03 PM john niolon <jniolon at att.net> wrote:
>>>
>>>> shop content... I drive my suburban into my shop
>>>>
>>>> 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
>>>> 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
>>>> 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)
>>>>
>>>> I just turned 75 and this might be my last set of tires  [image:
>>>> Grinning Face with Smiling Eyes] … so I'm looking for your thoughts on
>>>> Michelin or others afa mileage, ride, noise etc.
>>>>
>>>> thanks
>>>> john
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