1. Attachments are working again! Check out this thread for more details and to report any other bugs.

Can too much oil affect your mileage?

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

  1. Walker1

    Walker1 Empire

    Joined:
    Jan 13, 2006
    911
    6
    0
    Location:
    FL
    Vehicle:
    2014 Prius
    Model:
    Two


    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

    Joined:
    Jul 7, 2004
    3,998
    18
    0
    Location:
    USA
    Vehicle:
    Other Non-Hybrid
    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

    Joined:
    Jan 13, 2006
    911
    6
    0
    Location:
    FL
    Vehicle:
    2014 Prius
    Model:
    Two
    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

    Joined:
    Nov 25, 2005
    27,665
    15,663
    0
    Location:
    Huntsville AL
    Vehicle:
    2018 Tesla Model 3
    Model:
    Prime Plus
    It seems to have an effect:

    [​IMG]

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

    Ichiro Member

    Joined:
    Apr 25, 2008
    335
    13
    0
    Location:
    SF
    Vehicle:
    2008 Prius
    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

    Joined:
    May 3, 2005
    4,096
    82
    13
    Location:
    USA | Oregon | Portland area | 97004 |
    Vehicle:
    2007 Prius
    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

    Joined:
    Mar 27, 2008
    358
    62
    0
    Location:
    Midwest US
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Advanced
    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

    Joined:
    Apr 1, 2008
    29
    0
    0
    Location:
    LA, CA
    Vehicle:
    2008 Prius
    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

    Joined:
    Aug 12, 2007
    76
    0
    0
    Location:
    Snohomish, WA
    Vehicle:
    2007 Prius
    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

    Joined:
    Jan 13, 2006
    911
    6
    0
    Location:
    FL
    Vehicle:
    2014 Prius
    Model:
    Two
    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
(You must log in or sign up to post here.)