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  1. #1
    Member bk T's Avatar
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    Default Over-filled Mower oil

    I accidentally over-filled my mower's engine oil when topping up.

    Do I really need to drain it out to the correct level, or, just leave it?

    Cheers.

  2. #2
    Older by the minute
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    Default Re: Over-filled Mower oil

    You should go back to the correct level. You could use a syringe or a piece of hose. Put the hose in as far as you can, put your thumb over the hose and draw it out. Take thumb off to release the oil into a container and repeat until you have the correct amount of oil removed. Otherwise, lay the mower on its side and let the oil pour out...a bit messy that way though.

  3. #3
    Seasoned Member allblack's Avatar
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    Default Re: Over-filled Mower oil

    Back in the days when I played with cars, over-filling the oil was a drama coz it impacted on the motor's ability to pump it. Something about the oil has to have enough room to move within its container in order to be used.

    That sounds crap, but in my defence it was a long time ago.

    Someone with current skills will advise. I'm curious.

    My call would be to drain it, and start again.

  4. #4
    Old guy
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    Default Re: Over-filled Mower oil

    Quote Originally Posted by Bryan View Post
    You should go back to the correct level. You could use a syringe or a piece of hose. Put the hose in as far as you can, put your thumb over the hose and draw it out. Take thumb off to release the oil into a container and repeat until you have the correct amount of oil removed. Otherwise, lay the mower on its side and let the oil pour out...a bit messy that way though.
    This is the correct advise. Too much oil will creat pressure and unless you are lucky may stuff things up somewhat.

  5. #5
    Member bk T's Avatar
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    Default Re: Over-filled Mower oil

    Bryan: "Put the hose in as far as you can, put your thumb over the hose and draw it out. Take thumb off to release the oil into a container and repeat until you have the correct amount of oil removed ."

    Good suggestion. Never thought of that.

  6. #6
    Remember Richard's Avatar
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    Default Re: Over-filled Mower oil

    Or suck it out until you are down to the correct level, but this is a stupid suggestion as oil tastes terrible. I have done it with petrol though!

  7. #7
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    Default Re: Over-filled Mower oil

    Overfilling oil and or fuel is never good.

    You need room for the fluid to expand when it warms up, too much and you get lack of pressure which affects the amount of oil the motor receives, can cause it to burn up faster due to the lack of the right amount supplied.

    This would cause more soot, clog your spark plugs but the worse of it, under lubricates the motor which can cause it significant damage.

    There is a little tolerance for overfilling however, but if its to the cap, you want to drain it.

  8. #8
    pcsourcepoint
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    Default Re: Over-filled Mower oil

    If pouring excess oil from mower, may want to remove air filter since oil may get soak it on some four stroke briggs mowers. Or just unscrew the drain plug...
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  9. #9
    amateur expert dugimodo's Avatar
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    Default Re: Over-filled Mower oil

    My last petrol powered mower with a B&S engine didn't have a drain plug, was amazed to discover tipping it out the oil filler was the official method to drain the oil.
    But for the last 2 years I've been using a battery powered mower, no more oil or petrol or air cleaners to worry about Not for everyone but I love it personally.
    Ryzen 2700X, 16Gb DDR4RAM, 512GB M.2 NVME SSD, MSI GTX1070

  10. #10
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    Default Re: Over-filled Mower oil

    Quote Originally Posted by Richard View Post
    Or suck it out until you are down to the correct level, but this is a stupid suggestion as oil tastes terrible. I have done it with petrol though!
    ever tried it with oil? - aint gonna happen!

    viscosity rulez

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