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Thread: "Does engine oil get old and go bad?"

  1. #1
    Senior Member "Does engine oil get old and go bad?" Afan's Avatar
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    "Does engine oil get old and go bad?"

    I was watching a video about the guy fixing 25 year barn find car, and there were some comments about the (25-year-old) oil in the car. Then did some "google-ing" and stumbled on this "article"
    oil change - Does engine oil get old and go bad? - Motor Vehicle Maintenance & Repair Stack Exchange

    I think it's worth reading. Not just what, than HOW the guy wrote it.
    Instead million dollars, give me million miles!

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    Funny guy.

    I am in the habit of 10,000 mile oil change intervals on my cars. PTW, more like 6,000 miles, weather and season dependent to some degree.
    As far as shelf life, yeah, never gone far enough to consider it, personally.

  3. #3
    Senior Member "Does engine oil get old and go bad?" happy's Avatar
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    Unused synth should be fine.
    Used oils will break down with different rates.


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  4. #4
    Member "Does engine oil get old and go bad?"
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    The article makes sense to me. However, we will never see a consensus opinion on the subject of "Motor Oil".

  5. #5
    Super Moderator "Does engine oil get old and go bad?" 670cc's Avatar
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    I’ve often wondered if new engine oil has a limited shelf life, but having NEVER seen an expiration date on a bottle of engine oil, I treat it as if it lasts indefinitely in the bottle, or in an engine where it has seen little or no run time.

    Even if expiration dates were to begin appearing on oil bottles, I’d be skeptical as to whether it really expired, or if the oil company just hopes you’ll throw it out and buy more for their own profit.
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    Senior Member "Does engine oil get old and go bad?"
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    I've been told that some acidity develops from combustion byproducts, so if it's going to sit for a long time it's a good idea to change first.

  7. #7
    Senior Member Jt105's Avatar
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    Quote Originally Posted by 670cc View Post
    Iíve often wondered if new engine oil has a limited shelf life, but having NEVER seen an expiration date on a bottle of engine oil, I treat it as if it lasts indefinitely in the bottle, or in an engine where it has seen little or no run time.

    Even if expiration dates were to begin appearing on oil bottles, Iíd be skeptical as to whether it really expired, or if the oil company just hopes youíll throw it out and buy more for their own profit.
    I could understand an open bottle of oil going bad from oxidation. Iím not worried about it though. I figure that it would take multiple years for oxidation to have any measurable effect. Any leftover oil in an open bottle gets used at the next oil change.

    JT

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    Quote Originally Posted by Junkie View Post
    I've been told that some acidity develops from combustion byproducts, so if it's going to sit for a long time it's a good idea to change first.
    If it ran a long time and was subject to all those combustion byproducts, then yes there may be an acidity of the oil. But motor oils have bases in them to neutralize those combustion byproducts, measured by TBN (Total Base Number). Point being, if it's time to replace your oil based on the reduction of TBN, it's just time to change your oil. It's not due to time passing.

  9. #9
    Senior Member "Does engine oil get old and go bad?"
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    Right, but if you're near there and going to let it sit for a couple years, it's probably a better idea to change before rather than after

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