140K maintenance specifics

Discussion in 'Gen 3 Prius Main Forum' started by H.S., Nov 20, 2025.

  1. H.S.

    H.S. Member

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    Hello,

    my 2015 prius is up for its 140k maintenance, but given the online research and talking to dealership and various maintenance shops. Also alot of the posts here suggest additional maintenance and precautionary steps that are not part of the manual specification.

    I accumulated a list of recs based on mileage from different sources, yet this doesn help and I feel lost
    Rec engine/cabin air filter dust build up
    Rec spark plugs
    Rec Hybrid battery fan service
    RecThrottle body /maf/efi services
    Rec Trans fluid service
    REc Collant Fluid Service
    Rec. Inverter fluid service low

    all that seems excessive and very costly, and i am writing this post to get a response from those who have been through it.

    Can someone please tell me what exactly toyota recommends according to their manual at 140k? no bells and whistles .
     
  2. Mendel Leisk

    Mendel Leisk MMX GEN III

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    The Toyota USA maintenance schedule stops at 120k miles or 12 years. Due to the awkward, event-by-event format I made a table format equivalent (with MS Excel), which lets you see at a glance the frequency of the various items. Then I extrapolated it, to 240k miles or 24 years. Spoiler: 140k miles is purely a tire rotation. :)

    That's not to say that's all that should be done, but that's up to you, and dependent on what's been done, or missed, in past. Also, there are a few items Toyota USA says nothing about, but worth considering:

    EGR cleaning
    Transaxle fluid replacement
    Brake fluid replacement
     
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  3. H.S.

    H.S. Member

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    thank you for this. I have saved the spread sheet to stay alter on what is needed. so spark plugs I never did, are they due at 140? also for your chart is this more precautionary or what you did to maintain your car based on your expereince or research?
     
  4. bisco

    bisco cookie crumbler

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    sparks were due at 120k, so you should do them when you have a change. people often say they look new at 120.
     
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  5. BiomedO1

    BiomedO1 Senior Member

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    Don't know how you missed spark plugs @ 120K
    Rec engine/cabin air filter dust build up - that should be changed around every 30K miles or visibility dirty or clogged. You should be able to do that yourself - dealership pricing for this service is outrageous.
    Rec spark plugs - should've been done @120k per OEM
    Rec Hybrid battery fan service - optional
    RecThrottle body /maf/efi services - optional; if your getting surging with a constant pedal - it needs to be cleaned. EFI is a bottle of Techcron (fuel injection cleaner) in your gas tank. Do that yourself.
    Rec Trans fluid service - optional, but you should get it done. IMHO it should be changed every 100K
    REc Coolant Service engine - should've been done @120K per OEM; footnotes states 50K mile change thereafter the initial change.
    Rec. Inverter coolant service - I believe that should be done @ 150K per OEM, most owners will change both at the same time - easier to track.
     
  6. Mendel Leisk

    Mendel Leisk MMX GEN III

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    FWIW, for the CARB States Toyota says 150k miles or 15 years, IIRC. Same plugs, same engine. :rolleyes:

    (I don't think I mentioned that in the spreadsheet, nor the "extreme" service)
     
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  7. ColoradoBoo

    ColoradoBoo Senior Member

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    Yes it's costly if you let it build and, suddenly, have a ton of maintenance needed. This is my schedule:

    Oil/Filter Every 6-months or 3,000 or 5,000 miles
    CVT/AT Tranny Every 6-years or 60,000 miles
    Air Filter As Needed (check every 6-months)
    Cabin Air Every 12-months (Charcoal)
    Differentials 1st-30K. Then every 30K if you tow else 60K
    **Since I don't drive my Tundra all that much, I now do front diff and transaxle every 4-years and rear every 2-years.
    Radiator Coolant Every 5-years or 50,000 miles
    Hybrid Coolant Every 5-years or 50,000 miles
    PCV Valve Every 50,000 miles
    Power Steering Fluid Every 3-years
    Tire Rotation Every 5,000 Miles
    Brake Fluid Test for water w/strips every 2 years
    Spark Plugs 2GR-FKS V-6 every 60,000 miles. Rest 120,000 (or 10-years, whichever comes first)
    Tire Replace When tread is at 2/32" or every 6-7 Years
    Brake Pads When pads are at 3mm. Also replace rotors.
    Timing Chain is a Lifetime item
     
  8. BiomedO1

    BiomedO1 Senior Member

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    Planned preventive maintenance is to prevent unplanned visits to the mechanic. I'm sure the spark plugs will go beyond 150K. You don't want an unexpected visit to the mechanic for a misfire. Diagnostic fees are around $400 now???
    He can get half of the required work done on this visit and the other half done on his next visit - hopefully no CEL in between.
    If your a gambler; you know that sometimes you win and sometimes you lose. Chances of losing decreases exponentially if OEM guidelines are followed.

    Good Luck.....
     
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  9. Mendel Leisk

    Mendel Leisk MMX GEN III

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    Total agreement.

    I should have added that in post #7, in the extra's list.

    The spreadsheets I created just follow the schedule, not saying I agree with it completely. Something's are perplexing, some are overkill, some underkill.


    Another thing that's IN the US schedule, but seems widely ignored, is a more in-depth brake inspection (not just the "visual inspection"), every 30k miles or 3 years.
     
  10. BiomedO1

    BiomedO1 Senior Member

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    Yea; I noticed no brake fluid flushes. I check mine every 20K mile intervals and it'll get flushed out at the 100K or 50K mile interval - even if it test good. It depends on how frisky I feel.:cool:

    Gotta hand it to the zoomers, if the brakes apply - they're good......o_O Probably why they're still in the basement.:(
     
  11. Mendel Leisk

    Mendel Leisk MMX GEN III

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    Toyota Canada now says to replace brake fluid every 3 years or 48k kms (~30k miles).

    They didn't say anything about brake fluid replacement, in 2010 (when we bought), but I noticed it starting in the 2014 model year documentation. 2014 was the apex for maintenance schedule clarity, ease of reading: actually a decent table format, service rows and kms/months columns.

    As of 2016 model year (first year of gen 4), the paper documentation says nothing. No schedule, of any format. You want to know what to do, go to Toyota Canada website, disclose the car's kms/months, and it'll tell you, obtusely, somewhat similar to the US schedule, at least the format.
     
  12. H.S.

    H.S. Member

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    thank you all for the info, I am really not financially capable of doing ALL due to precautionary so I want to recap to confirm to make sure I do what is needed based on TOYOTA's recs not "extra" or "ahead" as I wish I can afford that. so just to recap the must do at 140k:
    (note the spark plugs was told can wait till 140k or 150k by a reputable mechanic)

    -replace spark plugs
    -replace engine oil and oil filter
    - clean cabin air filter
    - rotate tires
    - inspect and adjust fluid levels

    am I missing anyting NECESSARY at this mileage?
     
  13. H.S.

    H.S. Member

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    can someone please confirm the info above?
     
  14. Mendel Leisk

    Mendel Leisk MMX GEN III

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    The extrapolated Toyota USA schedule I posted at the top says essentially a tire rotation. All the other items, you’re the only one who can determine that, based on what’s overdue, and so on.

    not mentioned, but have the brakes ever had a proper inspection? Not just the visual inspection specs every 5k miles, the one one they note every 30k.
     
    #14 Mendel Leisk, Dec 1, 2025 at 3:29 PM
    Last edited: Dec 1, 2025 at 3:35 PM
  15. Mendel Leisk

    Mendel Leisk MMX GEN III

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    never answered: the spreadsheet I posted is faithful to the Toyota USA schedule, up to 120k miles, and extrapolated to match, beyond.
     
  16. H.S.

    H.S. Member

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    I checked the doc and saved it when you first posted. at 150k has a long list. I am not mechanic so whoever will look at it can better diangose what is needed, hence me asking folks based on their expreince as I dont want to get scammed
     
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  17. Mendel Leisk

    Mendel Leisk MMX GEN III

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    Again, you're the only one that knows (hopefully) what has and hasn't been done in past.

    My 2 cents, for additional services to consider which are not in the US schedule:

    1. Transaxle fluid replacement, for $100~150 USD (Not in schedule, but worthwhile, at least once. Only use Toyota ATF WS, from freshly opened bottles.)
    2. Brake fluid replacement, for $100~150 USD (Not in US schedule, but Toyota Canada recommends every 48k kms (~30k miles), or tri-yearly, whichever comes first).
    3. Full EGR system cleaning, for $600~1000 USD. There are only a few competent shops doing this. Hybrid Pit Stop is luckily nearby to you, that's one of their services. Don't even contemplate having the dealership do it. (It's late in the day late for this, and never mentioned by Toyota, because it's their design shortcoming necessitating this. Just a heads up, presuming it's never been done: there's a strong correlation between neglecting to do this regularly, say every 50k miles, and head gasket failure, around 150K~200K miles. Someone may be along shortly to say the correlation is unproven.)