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Unread 04-23-2013   #1 (permalink)
Roush Jim is offline Rookie


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Default Should i use old motor oil?

I have some old motor oil that is in a plastic container that has never been opened and was wondering what your thoughts were. Does oil attract moisture like brake fluid does, is it safe to use, I think its about 10 years old. I hate to throw it out but don't want to damage my cars or equipment. THANKS!
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Unread 04-23-2013   #2 (permalink)
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Oil has improved over the last ten years so it's probably best to just use it as a top up oil as opposed to using the lot for a full oil change. If it was stored in an environment that has a steady temperature it is probably fine, but there is little chance the additives in it would be as good as what you will find on the shelf today.
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Unread 04-23-2013   #3 (permalink)
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you would risk damage for $5? Seriously..chuck it
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Unread 04-23-2013   #4 (permalink)
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I would consider using it 1qt at a time mixed with fresh...
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Unread 04-23-2013   #5 (permalink)
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oil has actually got worse in the last 10 years! less ZDDP. if it has been sealed up, i wouldn't think twice about using it. espesially in an older flat tappet engine!
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Unread 04-23-2013   #6 (permalink)
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oil has gotten worse? LOL Nothing could be farther from the truth. Different engines require different oil. A classic muscle car would benefit from higher zddp content (Shell Rotella T for example), but for todays engines it can have negative effects including damaging cats). I would rather play with live electrical wires than study about it, but to say oil has gotten worse is bologna. Technology and research does not work in defeat of itself.
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Unread 04-23-2013   #7 (permalink)
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don't know why i bothered....has been done too death.
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Unread 04-24-2013   #8 (permalink)
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Quote:
you would risk damage for $5? Seriously..chuck it
Agreed.

You are going to get a steady diet of opinions here on this subject, but I would always error on the side of caution here... Your engine is not worth the potential problems that you or anyone else can possibly see. Chunk it and spend the extra $30-$60 depending on what you use and be done with it. Oil like that I will keep around for household squeaks and crap like that or cleaning my rifle barrel in the field but not in my car.
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Unread 04-24-2013   #9 (permalink)
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I would mix it with new oil. 3/4 or the oil should be new, but if you're paranoid, go ahead and toss it
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Unread 04-25-2013   #10 (permalink)
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Oil is such a polarizing topic.

In all honesty, if you have to ask this questions its best to not use it.
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Unread 04-28-2013   #11 (permalink)
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Thanks for the answers, I guess I won't use it in the cars, kind of makes sense to spend a few dollars instead of useing it and wondering if it will work up to expectations, thanks for your time and opinions.
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