[Shop-talk] suv tires and oil question
Gene Garrison
gene at garrison-grafixx.com
Fri Jan 13 19:51:06 MST 2023
Thanks, ODB. And I apologize for not replying sooner.
Your points sound reasonable. And I also change oil more frequently
than recommended in the vehicles that I use regularly. But the last few
years, the TR6 is getting driven less than 1000 miles a year, hence my
question. Though generally I try to drive it for at least a half hour
whenever I fire it up.
Based on the feedback from the list, I think I'm going to be the wild
man and go with a two year interval. :)
- GeneG
On 8/29/22 20:02, old dirtbeard wrote:
> 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 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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