FAQ |
Members List |
Social Groups |
Calendar |
Search |
Today's Posts |
#21
|
|||
|
|||
I have a couple cases of Quaker State Deluxe 10W40 from the 80s or 90s unopened. Think it’s still any good?
|
#22
|
||||
|
||||
I don't have a clue as to how motor oil goes bad. Geez, the additives ARE still in that container along with everything else!!!
Then there was a thread some time ago debating as to whether or not to fill your oil filter when changing oil. Another deal I don't understand the need for a debate!!! The first place oil is pumped up is the filter!!! Motor oil is NOT potato salad!!! Skip, I've seen that fine sediment in quarts of "new" oil.
__________________
1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... |
The Following User Says Thank You to 77 TRASHCAN For This Useful Post: | ||
#23
|
||||
|
||||
I don't have a clue as to how motor oil goes bad. Geez, the additives ARE still in that container along with everything else!!!
Then there was a thread some time ago debating as to whether or not to fill your oil filter when changing oil. Another deal I don't understand the need for a debate!!! The first place oil is pumped up is the filter!!! Motor oil is NOT potato salad!!! Skip, I've seen that fine sediment in quarts of "new" oil.
__________________
1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... |
#24
|
|||
|
|||
No scientific proof of this. But I would offer that engine oil does not, to my knowledge have an expiration date on the outer cases or the individual boxes. Almost all major oil manufacturers have a "Lifetime" engine guarantee on the oil they sell. If say 10 year old oil was causing engine failures, someone would be crowing all over the internet about it and filing a law suit against the oil company. Strictly an opinion here, if the oil has been stored in a cool, dry place in a sealed container, it would be very low on my list of 100 things to worry about on my hobby car engine. FWIW.
|
The Following User Says Thank You to mgarblik For This Useful Post: | ||
#25
|
||||
|
||||
My rep says 5 years. But maybe that is to cover their butts. I know I’ve used oil way older than that, and on some of my low use vehicles, the oil is older than that in the pan.
__________________
LIFT HEAVY, LIFE IS TOO SHORT TO BE SMALL! |
The Following User Says Thank You to BILL BOWMAN1 For This Useful Post: | ||
#26
|
|||
|
|||
Well I poured out one of the Mobil 1 quarts I don’t know if it’s supposed to have an orange tint to it but it does. Then cut the bottle in half it had a thicker than the actual oil coating on the bottles inside a little darker orange also. So a lot of the bottles have orange stains on the outside of the bottle I’m starting to think it was leaching through the bottle. I haven’t done it yet but will do the same with one that’s not stained and see what I find.
|
#27
|
||||
|
||||
Quote:
Geeez Last edited by Formulajones; 05-17-2024 at 07:30 AM. |
#28
|
|||
|
|||
Quote:
Same here, some get barely moved around from my shop to the storage barn. In the last 12 years ...lol |
#29
|
||||
|
||||
Wow. Vehicles you still start and drive on occasion? That's what it sounded like Bill is doing. I'd love to see an oil analysis posted up on that, I've never left one in that long to even send in a sample, don't think I want to. Even the nomad which I parked in about 1990-ish still gets it's oil changed once a year. I start it up to move around only and maybe every 6 months I'll cruise it through the neighborhood just to exercise it.
|
#30
|
|||
|
|||
Cut open a bottle that was not stained the oil is the same color but the bottle did not have the thick layer on the inside. If you’re looking for a great deal on oil stop and see me at Norwalk we will have two cases of BP for sale at a big discount.
|
#31
|
||||
|
||||
Quote:
|
The Following User Says Thank You to JSchmitz For This Useful Post: | ||
#32
|
|||
|
|||
Oil isn't born with additives thats why they are added,
Be interesting to know the circumstances in which these additives are added IE the environment in which this magic takes place. Is this replicated at startup or run time. Does the molecular structure of the additives break down and turn into another compound, Break down into basic elements? or do they just fall out of suspension
__________________
If your not at the table you're on the menu A man who falls for everything stands for nothing. |
The Following User Says Thank You to Formulas For This Useful Post: | ||
#33
|
||||
|
||||
Quote:
Agree. Just add a can of 20 year old STP and you’re good to go! 👍
__________________
" Darksiders Rule "
|
#34
|
|||
|
|||
Quote:
If a car or motorcycle is being put back into regular street or racing duty , I obviously flush ALL the old fluids including brakes etc Its fun to do that its like finding " barn finds" in your own barn... im my best customer.! Peter |
#35
|
||||
|
||||
Quote:
I had a '55 Chevy Sedan Delivery. It had a 235 straight six, three on the tree, and factory 4:10 gears. That thing burned oil almost as fast as gas! I would buy the thickest oil I could find. I think it was straight 50w. Then I would pour in STP or Motor Honey (whichever was cheaper). Ran like a top though! |
#36
|
||||
|
||||
Quote:
I found more than I can ingest or understand, but this paper has a good discussion about all the different chemical mechanisms that can cause changes over time: Link to Thermal Degradation Paper More importantly, the results of accelerated testing at multiple temperatures allow the engineers to quantify the changes as a function of both time and temperature, which gives them tools for predicting life and comparing formulations. It won't substitute for real life testing but gives them some lab tools to understand what's happening in service. At a high level, they report a thermal activation energy of about 0.9 eV for many combined effects. This is a high value in the world of this stuff, which means temperature is a HUGE influence on the chemical stability. I used to do similar testing to predict product reliability. Clearly, nobody can wait for 10 years of testing before shipping a new product. Accelerated temperature testing is one common method to characterize chemical degradation as a basis for life predictions. With this published data the "acceleration factor" (ratio of time at temperature for the same effect) between room temperature storage and 150C is ridiculously high, so by itself, isn't going to contribute to this debate. I agree that a manufacturer's shelf life recommendation will be VERY conservative, but they are dealing with so much uncertainty about HOW and WHERE their product is stored, they won't take chances. Another challenge for them and for us is guessing "how much change" is OK? All oils will start to degrade as soon as they go into the bottle. So how much change is allowed? How much change in viscosity is OK for you? What percentage loss of additives is OK? You all get the complexity.... Me - if I opened an old bottle and it was clear, I'd use it..maybe up to 20 years. If it was dark, smelled funny, or was cloudy, I wouldn't. And I would not run a steady diet of old oil. I'd either dilute it or alternate with new oil. My 2 cents Mike |
#37
|
||||
|
||||
Quote:
|
Reply |
|
|