[Shop-talk] suv tires and oil question

Mon Aug 29 13:43:40 MDT 2022

Side note: Recently bought a Ford Cobra 8.8 diff that was a NOS piece from a closed dealership. Date tag was 1997. I opened it up and the diff oil had turned to white paste, it smelled awful but had a definite gear oil aroma. These had the Trak-Lok "limited slip" so it's possible the modifier additive had separated, but I checked with a few experts and all agreed it was safe to run after cleaning it out.

So after 25 years, I can confirm that oil does "go bad".

________________________________
From: Shop-talk <shop-talk-bounces at autox.team.net> on behalf of Gene Garrison <gene at garrison-grafixx.com>
Sent: Monday, August 29, 2022 11:54 AM
To: shop-talk at autox.team.net <shop-talk at autox.team.net>
Subject: Re: [Shop-talk] suv tires and oil question

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<mailto: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<mailto: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<mailto: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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