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

Oil Catch Can for Gen 3 with 30K miles?

Discussion in 'Gen 3 Prius Accessories and Modifications' started by NewHybridOwner, Jun 6, 2019.

  1. NewHybridOwner

    NewHybridOwner Active Member

    Joined:
    Nov 21, 2018
    607
    279
    0
    Location:
    W. Michigan
    Vehicle:
    2015 Prius
    Model:
    Four
    Our 2015 Prius Four has just passed the 30K mark. Should I think about installing an Oil Catch Can, and if so is there a particular kind that is preferred?
     
    James Powers and Pluggo like this.
  2. egn83b

    egn83b Junior Member

    Joined:
    Sep 6, 2018
    59
    20
    0
    Location:
    Rarford nc
    Vehicle:
    2011 Prius
    Model:
    Two
    You can it would be easy.. I wipe the pool of oil at butterfly valve with a paper towel and screw drive from time to time. At 50k miles i clean out the intake. Right doing on time maintence i sit at 120k.

    Posted via the PriusChat mobile app.
     
  3. Mendel Leisk

    Mendel Leisk Senior Member

    Joined:
    Oct 17, 2010
    54,603
    38,177
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    I put in a Moroso 85474 (Universal) Air-Oil Separator. For some cars they sell it with specific brackets and install instruction; the 85474 is basically the one for any and all. The only thing is you need to come up with some sort of mounting bracket on your own.

    It only comes with 3 foot, of SAE30-R7 spec fuel line hose, you'll likely need to buy more. Still it's relatively easy to get at automotive specialty stores, and not expensive.

    Be prepared for sticker shock with that can though; a lot of Priuschatters are going for much cheaper one, by Ruen??

    This is THE oil catch can thread:

    Oil Catch Can, Eliminate that knock! | PriusChat
     
    bisco, James Powers and Pluggo like this.
  4. Raytheeagle

    Raytheeagle Senior Member

    Joined:
    Jul 1, 2016
    11,251
    15,476
    0
    Location:
    Bay Area, California
    Vehicle:
    2019 Prius Prime
    Model:
    Prime Plus
    Install it;).

    I’m putting one in our 2019 prime soon:).

    Keep the light components out(y).
     
    James Powers likes this.
  5. James Powers

    James Powers Senior Member

    Joined:
    Sep 11, 2017
    396
    555
    0
    Location:
    Bay Area
    Vehicle:
    2014 Prius
    Model:
    Two
    Do it! and read up on those links that @Mendel Leisk posted.

    I bought mine at 82k and had a blown headgasket at 140k. If I would have known about the certain services you should do that aren't necessarily "normal services" like cleaning out the EGR circuit.. Adding this will help eliminate a cold start knock you will eventually hear if you dont do. I bought the one that is in that thread.
     
  6. mjoo

    mjoo Senior Member

    Joined:
    Nov 9, 2016
    1,106
    1,311
    12
    Location:
    Michigan
    Vehicle:
    2010 Prius
    Model:
    III
    Cold start knock puts extra stress on the headgasket. I never get the cold start knock as long as I empty the OCC
     
    #6 mjoo, Jun 7, 2019
    Last edited: Jun 7, 2019
  7. Montgomery

    Montgomery Senior Member

    Joined:
    Sep 11, 2015
    2,254
    2,233
    2
    Location:
    Orange County, CA
    Vehicle:
    2015 Prius
    Model:
    Two
    The Prime's EGR circuit is different from the Gen III motor. You should not get the clog and back up issues that our motors get. It was a Toyota change.
     
    Raytheeagle likes this.
  8. Raytheeagle

    Raytheeagle Senior Member

    Joined:
    Jul 1, 2016
    11,251
    15,476
    0
    Location:
    Bay Area, California
    Vehicle:
    2019 Prius Prime
    Model:
    Prime Plus
    And you know this how:whistle:?

    I understand the design change, but every egr system I’ve run across has clogging issues:cool:.

    Data is best, and I’d like to see the actual results from in service and 100k mile Plus situations ;).

    I’ll get there eventually, but until then, I’ll look at the catch can install (y).
     
    James Powers and mjoo like this.
  9. StarCaller

    StarCaller Senior Member

    Joined:
    Feb 15, 2014
    1,240
    692
    0
    Location:
    Cedar Crest, NM, USA
    Vehicle:
    2014 Prius
    Model:
    Two
    are they exchangeable ?
     
    Raytheeagle likes this.
  10. Montgomery

    Montgomery Senior Member

    Joined:
    Sep 11, 2015
    2,254
    2,233
    2
    Location:
    Orange County, CA
    Vehicle:
    2015 Prius
    Model:
    Two
    I knew someone was going to ask me "and you now this how?". If you go to the thread where they discuss the engine rebuild and the differences between the Gen III and Gen 4, it goes over how one of the tubes has been redesigned higher on the Gen 4 block, therefore keeping oily air from clogging system. I don't remember the exact location here in Priuschat, but its here. I didn't make it up. Hope this is helpful. Not meaning to mislead anyone. All the data is in the thread regarding this.
     
    #10 Montgomery, Jun 9, 2019
    Last edited: Jun 9, 2019
  11. Jon Watkins

    Jon Watkins Active Member

    Joined:
    Jan 28, 2018
    117
    109
    0
    Location:
    Bluffton SC
    Vehicle:
    2017 Prius
    Model:
    Three
    I put one on my 2015 when I bought it with 37k miles. Cheap insurance.
     
  12. Mendel Leisk

    Mendel Leisk Senior Member

    Joined:
    Oct 17, 2010
    54,603
    38,177
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    The Oil Catch Can is a modification to the Positive Crankcase Ventilation system. It might, and likely does improve things for the EGR though. It basically catches air-borne crud between the PCV valve and intake manifold.
     
  13. mjoo

    mjoo Senior Member

    Joined:
    Nov 9, 2016
    1,106
    1,311
    12
    Location:
    Michigan
    Vehicle:
    2010 Prius
    Model:
    III
    Without engineering experience or extensive test data proving it, there is no way to know ahead of time how effective the gen4 pre-cat will be at reducing particulate matter and for how long. Maybe the pre-cat is a wimpy device that craps out at 100k miles thus causing problems after the warranty? Wierder things have happened.