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Signs of Oil Overfill?

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by SB6, May 1, 2023.

  1. SB6

    SB6 Member

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    What are the signs of an oil overfill?

    I did an oil (and filter) change yesterday evening on my sloped driveway, and not much oil came out, despite trying to account for the slope by having the front of the vehicle on the lower side of the slope. I added about 4.5 - 5.0qt of new oil, but now I'm stressing and thinking there was still a lot of oil left in the engine when I added the new oil.

    I checked the dipstick this morning, and it seemed way over the 2nd/top dot, but it's a bit difficult to read/trust the dipstick on this car, I think. I saw a suggestion to remove the dipstick, wipe, wait 5 minutes, then reinsert and check again. I will try this after work today. Tried this, pictures attached of both sides of dipstick.
     

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    #1 SB6, May 1, 2023
    Last edited: May 2, 2023
  2. burebista

    burebista Active Member

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    4.4qt with filter changed.
    3.9qt with old filter.

    So I guess that's overfilled from your description.
     
  3. rjparker

    rjparker Tu Humilde Sirviente

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    Its overfilled. Get a manual suction pump and remove some from the dipstick.



    It can also be used for every other 5k oil change without changing the filter or getting under the car. Also great for lawnmowers and other small engines.
     
    #3 rjparker, May 1, 2023
    Last edited: May 1, 2023
  4. SB6

    SB6 Member

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    Ugh, yeah I guess I will have to remove some oil. I have this pump I had bought and used for changing the transmission fluid.
    FloTool 10803 Transfer Pump https://a.co/d/2ct2m6X
    You think it'll work? Maybe I'll need some kind of adapter to fit the dipstick tube properly?

    I should be able to later reuse the oil I'm removing, right?
     
  5. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    That pump should work fine, says it includes a dipstick tube adapter.

    You can safely re-use the oil assuming that your pump and storage containers are clean-clean.
     
  6. SB6

    SB6 Member

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    For the container, I'll just use the empty engine oil bottle. What can I do to make sure the pump is clean? Take it apart, rinse, and wipe down? Although I don't know if I can take this pump apart and reassemble it properly
     
  7. Mendel Leisk

    Mendel Leisk Luddite

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    Yeah this works. Make sure you’re on level ground too. (y)

    for draining oil (haven’t needed to do this in some years) I would loosen the drain bolt till almost out, then slightly more while holding it very firmly and canted slightly, get a trickle going.

    Hold some sort of graduate to catch the trickle, and hold that pose ‘till the required amount has drained. Or your arm starts shaking too much. :unsure:
     
  8. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    If it were me, I'd only use that pump if I knew I'd only put clean fluids through it previously. (I do have one, and it has only ever had clean gasoline through it.)

    If it had been previously used for a waste fluid, I'd probably just get another and label them both for future reference.
     
  9. rjparker

    rjparker Tu Humilde Sirviente

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    My fluid extractor came with two hoses, one about 1/4" od, the other around 3/8. Only the 1/4" od hose fits in the dipsick tube and makes it through a bend downstream. It is also over 6 feet long and uses most of the length by the time the hose gets into the pan. That is when the attached container is up by the radiator.

    Easy enough to try just don't force it. The pressure will be on the output side so be sure yours has a tight fit there and won't fly off. My extractor has a container on the pressure side.

    Otherwise be prepared for a full drain and refill. Measure what comes out after a drain to know if you got most of it out. My experience is about 4.25 quarts if it was full to begin with. So I use four quarts, run it and check a few minutes after shutdown. If its an oil burner a quarter of a quart over is ok. Otherwise with an overfill you are just dumping more oil into the intake manifold through the pcv. Not good when unintended oil and condensate ends up in the cylinder. Normal blowby is bad enough.
     
    #9 rjparker, May 1, 2023
    Last edited: May 1, 2023
  10. Georgina Rudkus

    Georgina Rudkus Senior Member

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    I prefer this one, since the tube will fit right into the dipstick tube.



    500/550ml Large Syringe with 31.5 Inch Tube, Extra Big Plastic Garden Syringes for Liquid, Paint, Epoxy Resin, Oil, Watering Plants, Scientific Labs, Refilling


    Usually, since I often check oil level, I only fill the engine with 4 quarts so it will reach the mid mark between the fully fill and needs to be add level. That is apparently the designed most efficient level.
     
  11. SB6

    SB6 Member

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    I parked at the foot of my driveway after work, removed and wiped the dipstick, then came back and checked like 20 minutes later. I've attached pictures of both sides of the dipstick.

    Thoughts?
     

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  12. ASRDogman

    ASRDogman Senior Member

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    4.5 qts for refilling. EVERYTIME I put in 4.5 qts, it's ALWAYS on the top dot.
    You need to be on level ground. Next time you fill the gas tank you can check it.

    My routine is to stop at the pump, engine NOT running. Write down the mileage.
    Miles traveled, and displayed MPG.
    Them pop the hood and gas door. Run the credit card. Start pumping 1 gallon.
    Make sure the correct dollar amount matches. Then I set the pump handle to
    fill the tank. Then I open the hood, pull the dip stick, wipe it off, insert it and remove it
    and check the level. Replace the dipstick, close the hood and wait for the pump to finish.


     
  13. CR94

    CR94 Senior Member

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    I can't tell anything from the dipstick photos alone. Draining with the car headed downhill, OR putting in near 5 quarts, OR not changing the filter would've led to overfilling. It looks like you may have done all three, so it's almost definitely overfilled.

    For reasonably complete oil draining, headed uphill is not as bad as headed downhill, if you can't find a convenient level spot. Better, run the low end or low corner up on boards or something to get it nearer level.

    Toyota says refill with only 4.4 quarts if you're changing the filter, or 4.1 if not.