2013 Prius sudden oil consumption, PCV valve ok

Discussion in 'Gen 3 Prius Technical Discussion' started by romanlutsk, May 3, 2020.

  1. taxidriver50005

    Joined:
    Jan 3, 2017
    99
    88
    0
    Location:
    GB
    Vehicle:
    2012 Prius
    Model:
    Excel
    Lots of modern cars now use low tension rings and now also burn oil....think Audi are famous oil burners
    Posted via the PriusChat mobile app.
     
    Tim Jones and Mendel Leisk like this.
  2. ASRDogman

    ASRDogman Senior Member

    Joined:
    May 29, 2018
    3,611
    2,182
    0
    Location:
    Florida
    Vehicle:
    2010 Prius
    Model:
    Two
    Only 1 person on Prius chat, that I have seen, has show any pistons, and those rings were not stuck
    and were clean.
    Worn and/or weak rings will cause oil leakage into the combustion chamber and get burned.
    But, valve guide seals DO get hard and brittle, and do allow oil to get sucked into the combustion
    chamber to get burned.
    Soaking the rings should cause any damage and hopefully will clean out any carbon build up
    between the rings and piston allowing them to function better.
    I'm still waiting to hear back from the ones that have replaced the valve guide seals on if the oil
    consumption has gone down.
    I know the valve guide seals I've replaced on various engines have reduced the oil consumption.
     
    #22 ASRDogman, May 26, 2020
    Last edited: May 26, 2020
    Tim Jones likes this.
  3. Mendel Leisk

    Mendel Leisk Sand Pounder

    Joined:
    Oct 17, 2010
    45,008
    32,157
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    @The Critic got his head rebuilt with head gasket replacement. Not sure if the seals were replaced. Maybe he will see this and comment.
     
    ASRDogman likes this.
  4. Simonak

    Simonak Member

    Joined:
    Oct 5, 2013
    51
    32
    0
    Vehicle:
    2010 Prius
    Model:
    III
    I was burning 1qt every 2k for past 50k miles. Im at 100k atm.
    I tried new PCV clean intake EGR installed oil catch switched 1y to 5W30 oil but nothing
    had any effect on the rate of burning oil.
    Last oil change I did try get high millage mobil1 0W20 and after the winter looks like the oil consumtion
    is low or hard to tell because the oil after 7k miles is still clear and hard to measure.
    Usually at this point the oil is pretty dark.
    I normally use mobil1 0W20 and change every year or 10k whatever come first.
     
  5. farmecologist

    farmecologist Senior Member

    Joined:
    Jun 25, 2015
    1,622
    1,502
    0
    Location:
    Southern MN
    Vehicle:
    2010 Prius
    Model:
    II
    Uhh...so one person pulling the pistons is conclusive evidence? I think not. :whistle:

    At any rate, none of the theories we have discussed here have been conclusively proven as far as I am aware...so anyone could be 'correct'...the jury is still out.

    Personally, at this point I have given up trying to figure out the consumption on our 2010 and just monitor the usage closely and top off as needed.
     
    Ed Beaty and Raytheeagle like this.
  6. ASRDogman

    ASRDogman Senior Member

    Joined:
    May 29, 2018
    3,611
    2,182
    0
    Location:
    Florida
    Vehicle:
    2010 Prius
    Model:
    Two
    I NEVER said that ONE person pulling the pistons was conclusive evidence, YOU just did.
    I only stated that someone did and he had no problems. The pistons did not show any sings of blow by.
    Which they would if the rings were stuck.

    Has anyone else pulled the pistons to check the rings??? The one person is the only one I've seen.
    If you know of others, please let us all know.

    A lot of people have replaced the head gasket but have not gone any further. That would be the time
    to replace the rings and hone the cylinders.

    But experience I have from engines I've worked on, the valve guide seals were all hard and brittle,
    and the rings were clean and free.

     
    Tim Jones likes this.
  7. Tim Jones

    Tim Jones Senior Member

    Joined:
    Jul 17, 2018
    1,118
    407
    3
    Location:
    SE Texas
    Vehicle:
    2013 Prius v wagon
    Model:
    XLE AWD-e
    I usually run 10 w 40 and can't tell a difference but have Mobil 1 15 w 50 in now and purs like a kitten....
     
  8. farmecologist

    farmecologist Senior Member

    Joined:
    Jun 25, 2015
    1,622
    1,502
    0
    Location:
    Southern MN
    Vehicle:
    2010 Prius
    Model:
    II
    Lol...you certainly implied it. Not worth arguing over...but I have to question misleading posts. :whistle:
     
  9. ASRDogman

    ASRDogman Senior Member

    Joined:
    May 29, 2018
    3,611
    2,182
    0
    Location:
    Florida
    Vehicle:
    2010 Prius
    Model:
    Two
    I certainly did NOT imply it.
    It is NOT a misleading post.

    Not my fault you miss read it.

     
  10. romanlutsk

    romanlutsk Junior Member

    Joined:
    May 1, 2015
    73
    10
    0
    Location:
    Cupertino, CA
    Vehicle:
    2002 Prius
    Model:
    N/A
    I just realized that I used high mileage oil (Valvoline 0w-20 full synthetic high mileage oil) on that car back in May of 2017 (@ 191748 miles) when I first got it from an auction. The second oil change was in August 2018 (@ 197742) with Penzoil full synthetic (not high mileage) and the last was in August of 2019 @ 201761 (castrol edge full synthetic).

    Is it possible that the high mileage oil used back in 2017 caused the valve guide seals to expand and temporarily stop/slow down the oil consumption?

    Should I try using high mileage oil again? (any problems using it for all the oil changes from now on?). I've just read that the high mileage oil (by design) has additives to swell seals, and if you subsequently go back to regular oil the seals will shrink and then some. In short: once you start with high mileage oil, best to stick with it. Is that really the case and maybe I shouldn't have used the high mileage oil in the first place?

    Thanks again!
     
    Mendel Leisk likes this.
  11. Simonak

    Simonak Member

    Joined:
    Oct 5, 2013
    51
    32
    0
    Vehicle:
    2010 Prius
    Model:
    III
    Not sure but in my case for the first time in 50k miles driven the oil is staying same level for the past 2k+ miles and I used to burn 1qt. per 2k.
     
  12. johnHRP

    johnHRP Junior Member

    Joined:
    Aug 6, 2014
    53
    19
    0
    Location:
    tally, fl
    Vehicle:
    2008 Prius
    Model:
    ----USA----
    Well, without replacing with new PCV valve you cannot rule out that it is PCV valve problem. I will start with $10 PCV valve replacement first. Check the blow by by opening oil filler cap and see if you feel excessive blow by from worn piston rings. Offcourse, you need other prius to compare it with.
     
  13. romanlutsk

    romanlutsk Junior Member

    Joined:
    May 1, 2015
    73
    10
    0
    Location:
    Cupertino, CA
    Vehicle:
    2002 Prius
    Model:
    N/A
    Thanks. Yes, after the PCV was replaced, the oil consumption has dropped in half, but it's still pretty high. Will check the EGR and try the high mileage oil.
     
Loading...