Does motor oil go "bad"?
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This is a discussion on Does motor oil go "bad"? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Hey guys, I get the 5-qt Mobil 1 synthetic stuff from Wallyworld to do my oil changes, and leave just ...

  1. #1
    Registered User burgerboy's Avatar
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    Does motor oil go "bad"?

    Hey guys,
    I get the 5-qt Mobil 1 synthetic stuff from Wallyworld to do my oil changes, and leave just about half a quart each time when it's all done. After 3 or 4 times, I've accumulated quite a bit of never used oil. The problem is, parts of it (I pour the leftovers into the same container) may be 6~9 months old.

    Is this oil still safe to use? It'd seem like such a waste just pouring it out, it's like $5 a quart!

    I was thinking about using up the old stuff for my next oil change. What do you think?
    J
    2004 WRX PSM Wagon
    Mesh hood scoop and grille

    2005 Kawasaki Ti 636

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  3. #2
    Registered User wrxrolla's Avatar
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    It should be fine as long as it has been sealed.
    Andrew

    Never quit. Never do the expected. Never follow.
    http://www.cardomain.com/id/wrxrolla

  4. #3
    Registered User burgerboy's Avatar
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    The oil all sits in one container capped, but the seal was broken when I open the original container for the oil change.
    J
    2004 WRX PSM Wagon
    Mesh hood scoop and grille

    2005 Kawasaki Ti 636

  5. #4
    Registered User tarbaj's Avatar
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    Oil doesn't get old and go bad unless it's been run through an engine. Ifunsealing it was a problem they better stop shipping oil in plastic containers. Many things can seep through plastic at a microscopic level.

    The oil is fine. Use it when you ahve enough leftover for a full change.

  6. #5
    Registered User Jörg's Avatar
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    It should be fine. As I understand it, oil actually can go bad, but it takes several years. I've read that the shelf life is about three years for oils designed for passenger cars.

    If you're worried about it, I'd suggest that from now on you use the old oil first, and then finish filling with the new. That way you're only holding oil from one change, instead of saving until you have a full bottle of "left-overs".

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