Ergo is you change oil before storage in winter, there is no reason to
change it again when it comes spring driving time. I think that issue was
at the heart of this thread, so I wasn’t picking your thread apart. I am
just trying to cut through the mysticism and find out if oil goes bad
sitting over a winter. On the two counts you and I have discussed, I’d say
it does not.

Say, this list still has some life in it! This discussion takes me back 20
years.

Jim

On Sun, Oct 10, 2021 at 9:48 PM Geoffrey Toye <geoffreytoye@gmail.com>
wrote:

> Yes, if you change the oil before storage then there will be no blowby gas
> during storage.  If you don't, then the old oil will have seen lots of
> blowby gas before storage.
>
> Yes, oil cans don't have an expiration date. The antioxidants are consumed
> by an operating engine.
>
> On Sun, Oct 10, 2021 at 5:43 PM Jim Felder <jim.felder@gmail.com> wrote:
>
>>
>>
>> Sent from my iPhone
>>
>> > In response to David’s welcome and detailed analysis of acidity, water
>> gets
>> > into the oil system by way of the blow by gasses that pass the piston
>> rings.
>>
>> So, if the car isn’t being driven during storage there can be no blowby.
>> Hence no water in the oil. So scratch that reason, right?
>> >
>> > Oil contains anti oxidants that are life limited. Old oil cannot protect
>> > your engine.
>>
>> I have never seen an expiration date on a can of oil. So scratch that
>> reason as well.
>>
>> I could be wrong of course but I can’t see these so-called threats being
>> realized.
>>
>> Jim
>> >
>> >>>
>> >>
>>
>