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イリジウム
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Yeah I think in most cases using fresh oil should cut precipitation down. Seen Euro axle oil with a 2-3 year EXPIRATION DATE. But once you fill it in, why does it become lifetime fill? ;)

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although I don't usually have oil that's more than a year old and I'm obviously shaking the bottle before I can see the bottom of it.
 

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Yeah I think in most cases using fresh oil should cut precipitation down. Seen Euro axle oil with a 2-3 year EXPIRATION DATE. But once you fill it in, why does it become lifetime fill? ;)
It would take many, many years for unused motor oil to degrade over time, particularly synthetic. The issue with additive package sediment is a separate issue, and probably goes away when the oil heats up and the particles gets dissolved, so probably doesn't help much to shake it up. It might help to store it in a warmer place. But I have never noticed sediment in the bottom of the container of any motor oil I have used (mostly Mobil 1).
 

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Speaking of "expiration dates" I recently checked the two x 1 gallon Maxlife ATF fluid jugs I bought about 2 yrs ago and stored in my home in a cool dark Rubbermaid tote, both crappy (PE?) bottles had developed seeping leaks and dumped > pint of fresh ATF into the tote, cursing I transferred all the remaining fluid into a stout polypropylene jug from my lab.

CAVEAT EMPTOR!
 

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If the additive sedemint is concenrning, why would you shake up the spooge? I've always been a fan of anything but Penzoil.
 

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If the additive sedemint is concenrning, why would you shake up the spooge? I've always been a fan of anything but Penzoil.
Ive never been a fan of Pennzoil however if you shake the bottle up and mix the additive back in before you pour if in I would suspect it would be remixed during usage cycles. If you leave it in the bottom of the bottle you may be leaving out an important part of the additive package.

Sent from my VS996 using Tapatalk
 

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Ive used to those "sediments" bottom of oil cans cause i use high zinc redline oil.
Even mobil 1 delvac has something laying around.

i try to trust them and i shake them well before pouring oil in

By the way, redline told me their oil has no expiration date
 

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Discussion Starter #28

All Pennzoil motor oils can have a shelf-life of up to four years if stored properly and it is not necessary to shake the motor oil bottle before dispensing. Our formulations are carefully balanced so that the additives stay suspended within the motor oil.
Well, at least this part of Pennzoil's claim is false.
 

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Don’t know about false, but alkaline batteries for example, I’d use new rather than ones sitting on the shelf for 10 years, even if those technically haven’t expired.
 

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Don’t know about false, but alkaline batteries for example, I’d use new rather than ones sitting on the shelf for 10 years, even if those technically haven’t expired.
Batteries degrade over time and slowly loose their charge even when not under load. Unused motor oil in the original container is a completely different matter.
 

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Oil may not degrade but I’d think the additives do. Similarly I personally wouldn’t use old, even unopened coolant, particularly those with silicates.
 

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Just finished changing oil. Took three pictures. Can you see what the problem is? (Please ignore the weight for a second.)
View attachment 286425


View attachment 286426

View attachment 286427

See what the problem is? There is a lot of junk deposited on the bottom of the jug. I am truly surprised. The jug has been sitting in my garage for about a year. I never thought this is going to happen. This is Pennzoil Ultra Platinum made from natural gas. So according to radio ads, it is supposed to be a lot purer than the normal stuff. All the websites told me to shake up the oil really well because there is some good stuff deposited on the bottom so I want to shake it up really well so that I can distribute the precious stuff evenly. Is it really the true?

Two takeaways

1. It is a good idea to buy some oil and let it sit for a year or two so that all these junk can settle down a bit. A bottle fresh from Autozone might not be the best choice.
2. Probably still a better idea to shake it a bit for a big jug. I shook it a bit and most of the junk stayed on the bottom.

Any comments?
The expiration date was 18 NOV 2016!! So if it was sitting in your garage for a year, where was it the two years before that?

EDIT: Sorry, just saw John Anthony's response.
 

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I wouldn't worry one bit about the small bit of what is a chemical precipitate at the bottom of the bottle.

I've been seeing this for decades in all kind of lubricant bottles, it's what happens when something is left at a relatively low temperature for a long time without heating or agitation to keep the additives mobilized.

I doubt that the performance of the oil has been compromised significantly and would not hesitate to us it in my own car.

The most noticeable case i saw was some old two-stroke oil where a very coarse precipitate formed, having a soft gel-like consistency that didn't even clog the very fine screen at the bottom of the oil injection reservoir's gravity-fed outlet.
The black stuff is visibly alarming but harmless, and I wouldn't bother to shake the can or worry about this at all.

As to the tampering of bottles, the bonded-on foil is really hard for a criminal to fake. The break-away cap ring can surely by released without breaking it by those who struggle with such useless endeavors, but thankfully few products rely today only on the tightened cap to prevent leakage and/or fraudulent tampering efforts.

I have known WalMart to be casual about returns, encouraging some to help themselves to "free rental" of new merchandise. But, they keep records of who returned something, and someone is responsible for inspecting and returning everything to the shelves. It's not very different at Home Depot. I recently returned a pair of LED fluor-replacement bulbs (one was bad) and the WM clerk did carefully inspect and compare the bulbs I returned along with the one's that I brought up front as replacements. So they are aware of the losses that they no doubt incur when higher percentages of fraudulent returns come in at any particular store.
 

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I have been using PZ in the 5-qt containers for years and have also frequently seen the bottom deposits. The oil seems to work just fine or I would have lost my engine by now. It IS an interesting thing to see....one would wonder if PZ would be worried about bad PR even it it's harmless.
 

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Discussion Starter #37
I have been using PZ in the 5-qt containers for years and have also frequently seen the bottom deposits. The oil seems to work just fine or I would have lost my engine by now. It IS an interesting thing to see....one would wonder if PZ would be worried about bad PR even it it's harmless.
It is great and reassuring to know that Pennzoil worked well for you. But on a 2nd thought, I am truly surprised that Pennzoil has not been sued for false advertising. Recently, I heard that credit card companies got sued b/c husband got approved while wife did not. Burger King got sued because someone claims that its impossible burger was contaminated by real meat. Seems the case against Pennzoil is a lot less frivolous than these.
 
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