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Can too much oil affect your mileage?

Discussion in 'Gen 2 Prius Fuel Economy' started by Walker1, Jul 9, 2008.

  1. Walker1

    Walker1 Empire

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    It has been suggested that if the oil level in your crankcase is over the full mark your miles per gallon can be affected. It is this truth or speculation?

    In both of my Prius's the crankcase oil level is approximately 1/8 of an inch over the full mark. If anyone knows for sure on this issue please let me know. I personally have not heard of too much oil in the crankcase lowering miles per gallon.

    All feedback is appreciated.;)
     
    #1 Walker1, Jul 9, 2008
  2. Sufferin' Prius Envy

    Sufferin' Prius Envy Platinum Member

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    You have not "personally" heard? But it "has been suggested"???? What the heck does that mean? Did you have to read about it and it wasn't personally whispered into your ear?

    This topic has been beat to death and is all over PriusChat. A quick search will get you more information than will ever be posted in this - yet another :rolleyes: - oil overfill thread.

    oil level overfill site:priuschat.com - Google Search

    If you were a newbie, I may have considered being a little more diplomatic . . . but geeeessssssshhhhhhh! Member since Jan '06 with 852 posts. :confused:
     
    #2 Sufferin' Prius Envy, Jul 9, 2008
  3. Walker1

    Walker1 Empire

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    I have not used any search or advanced features since joining. I usually read posts and follow links. I will heed your advice.

    If you tell me something I'm not aware of that makes you look good and helps me learn new info. Sound good? ;)
     
    #3 Walker1, Jul 9, 2008
  4. bwilson4web

    bwilson4web BMW i3 and Model 3

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    It seems to have an effect:

    [​IMG]

    Bob Wilson
     
    #4 bwilson4web, Jul 9, 2008
  5. Ichiro

    Ichiro Member

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    My prius crankcase is over-filled too. Darned Toyota dealer.

    Any suggestions for easily & cleanly draining a half quart or so without resorting to removing the drain plug !? I was thinking about a really long straw :hungry:
     
    #5 Ichiro, Jul 9, 2008
  6. Bill Merchant

    Bill Merchant absit invidia

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    I used 1/4" aquarium air-tubing (slides down the dip-stick tube) and a large irrigation syringe. A bit difficult to pull the plunger out, but it worked for a minor over-fill.
     
    #6 Bill Merchant, Jul 9, 2008
  7. ualdriver

    ualdriver Member

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    SkyMall - Oil Extractor=

    [​IMG]

    a search on Google shopping with "oil extractor" has some items as well.
     
    #7 ualdriver, Jul 9, 2008
  8. AMG

    AMG New Member

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    Nice find, anybody have experience with this product ? does it work well with the Prius ?
     
    #8 AMG, Jul 10, 2008
  9. PearlDriver

    PearlDriver Junior Member

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    I just used a squirt bottle with a long tube. I took out 1 cup (was at full) increased mileage 2 mpg on the next day's 140 mile commute.
     
    #9 PearlDriver, Jul 10, 2008
  10. Walker1

    Walker1 Empire

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    How much under the full mark should the oil level be? Is there anything that most of you agree on regarding this issue? Also, how does someone gain 3-4 MPG by lowering the oil level?
     
    #10 Walker1, Jul 10, 2008
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