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Cadence · 18-10-2021, 10:05

Quote:

Originally Posted by Jim Cate

If you should watch the video in post 40 you might find some semi-scientific data that disagrees with your belief.

The testing isn't rigorous IMO, but it has more validity than the god-will-strke-your-engine-dead if you fail to change your nearly virgin oil at the one year point tales being promoted upthread.

Jim

Jim,
I would agree there were some good things pointed out in the video but only comparing the two new oils. The other testing was about the least scientific that I have ever seen.
Roger

**Jim Cate** · 18-10-2021, 13:43

Quote:

Originally Posted by Cadence

Jim,
I would agree there were some good things pointed out in the video but only comparing the two new oils. The other testing was about the least scientific that I have ever seen.
Roger

Roger, I don't want to watch the video over again, but did they not send the used oil for analysis, and did that analysis not report that the acidity was negligible and that the additives were still active and in good supply? And was the interior of the filter can that was dissected not free from corrosion?

From memory, that was my take.

Jim

Cadence · 18-10-2021, 14:14

Quote:

Originally Posted by Jim Cate

Roger, I don't want to watch the video over again, but did they not send the used oil for analysis, and did that analysis not report that the acidity was negligible and that the additives were still active and in good supply? And was the interior of the filter can that was dissected not free from corrosion?

From memory, that was my take.

Jim

Jim,
There was no control of samples. Some from a pick up and some from a tractor if I recall. I like you, don't care to watch it again but it sounds like comparing apples and oranges. A given no. of hours each on a similar engine engine would produce a valid comparison, or close to it. The video was horse feathers. JMHO
Roger

Compass790 · 18-10-2021, 15:28

I'll put it another way, can anyone show me an engine that has been stored for years with used oil in it that has been damaged by acid attack in the parts of the engine that are submerged in oil?

Not that I'm going to change any long held beliefs & why should I care if people throw away perfectly good oil. But it's enviromentally damaging wasting good oil, thats the part that annoys me

**Jim Cate** · 19-10-2021, 01:32

Quote:

Originally Posted by Cadence

Jim,
There was no control of samples. Some from a pick up and some from a tractor if I recall. I like you, don't care to watch it again but it sounds like comparing apples and oranges. A given no. of hours each on a similar engine engine would produce a valid comparison, or close to it. The video was horse feathers. JMHO
Roger

Really, the point of the video in re of the OP's question is that in both cases of oil with way more hours and significantly longer use/storage period the oils still had, according to the analysis of the oils, quite adequate properties for storage and continued use.

To me, this answers the OP's question reasonably well and refutes the folks who say it is necessary to change the oil or face engine damage.

The video may be "horse feathers", but the lab results were not.

Jim

Cadence · 19-10-2021, 09:21

Quote:

Originally Posted by Jim Cate

Really, the point of the video in re of the OP's question is that in both cases of oil with way more hours and significantly longer use/storage period the oils still had, according to the analysis of the oils, quite adequate properties for storage and continued use.

To me, this answers the OP's question reasonably well and refutes the folks who say it is necessary to change the oil or face engine damage.

The video may be "horse feathers", but the lab results were not.

Jim

Jim,
I'll buy that!
Roger

Bilgediver · 22-10-2021, 08:12

Quote:

Originally Posted by Compass790

I dont believe time is a factor. I asked valvoline about this & they said oil does not deteriorate in it's container. Ok the engine is not a container but I've seen old engines that have sat in a shed for over 10 years & the parts in the oil are pristine.
Always done hour changes with no problems.

But some people love to dispose of perfectly good oil thinking they are helping their engine.
Not looking for an argument though as I wont change my habits anyway.
YMMV

Some small diesels with crankcase mounted fuel pumps such as Volvo Yanmar Beta Nanni and many others suffer from fuel dilution where the diesel is leakage past the fuel pump plungers into the sump. If the pump is worn this leakage can be enough to create problems if the contaminated oil is not changed. This was possible with elderly Volvo engines most of which are now retired where the engine could run away running on the oil passing the rings.

Compass790 · 22-10-2021, 13:31

Apologies I'm having trouble with the bold parts, not all was meant to be in bold, oh well.

Quote:

Originally Posted by Bilgediver

Some small diesels with crankcase mounted fuel pumps such as Volvo Yanmar Beta Nanni and many others suffer from fuel dilution where the diesel is leakage past the fuel pump plungers into the sump. If the pump is worn this leakage can be enough to create problems if the contaminated oil is not changed. This was possible with elderly Volvo engines most of which are now retired where the engine could run away running on the oil passing the rings.

Pump plungers? are you talking lift pumps here or injection pumps?

That is a seperate mechanical issue not related to oil life [Bwithhout fuel dilution.[/B]

OP's question was does his 20 yr old oil have to be changed according to the calender.
[B]So far there have been many assertionsthat it does but no evidence
I'm not holding my breath waiting for evidence that oil needs to be changed every 6 months or even annually.
Of course there is acid byproducts from combustion[but the oil contains additives to combat that.
Whilst the engine is sitting there not combusting any fuel the acid content is not increasing as long as the additives still work AFAIK/B]
Then the question becomes how long do they still work for?
There are many that say 6 mths is the max.
I have a friend who has a diesel 4wd toyota that only gets rarely used & he gets oil analysis done. Last time he told me he was at 3 years & the analysis people said it was fine. Of course this is only one example but I would be grateful if someone can link me to a study that proves 6 mth or annual changes are necessary with modern oils.
My own '93 Toyota has only ever got km changes in over 300,000 km & it has been 2 years + btwn changes when I have been out of NZ.
Still runs very well but not a scientific study.

smj · 22-10-2021, 13:58

Have a year old half bottle of synthetic mix 10w40 and it definitely wasn’t right when it came out of the bottle.

**Wotname** · 22-10-2021, 14:27

Quote:

Originally Posted by smj

Have a year old half bottle of synthetic mix 10w40 and it definitely wasn’t right when it came out of the bottle.

What was wrong with it?

smj · 22-10-2021, 17:49

Quote:

Originally Posted by Wotname

What was wrong with it?

Thick and lumpy

Compass790 · 22-10-2021, 20:19

Quote:

Originally Posted by smj

Thick and lumpy

Interesting......
I wonder how the 1000's of famers across NZ & millions around the world seem to get by on their 200 litre drums of oil that often sit in their sheds for years that they do their oil topups & changes out of ?????
It's a mystery to me