120k mi on 2010 Prius - What services should I actually be doing?

Discussion in 'Toyota Prius Family' started by tallassazn, Aug 12, 2017.

  1. tallassazn

    tallassazn New Member


    I have a 2010 Prius with a little over 120k miles and I'm curious what actual services should I be doing or having the dealer do vs what will the dealer be trying to upsell me.

    From the Maintenance Log I see
    Inspect and adjust all fluid levels
    Replace Cabin air Filter (Watched a Youtube video and will just order a filter and do this myself)
    Replace Engine air Filter (already done myself)
    Replace engine oil and oil filter
    Replace spark plugs

    Should I be looking at replacing the Transaxle/Transmission fluid? Engine coolant and inverter coolant? Or just topping off the fluids?

    Debating replacing the spark plugs myself. Would genuine Toyota Spark Plugs be fine (from ebay) or should I get another brand.

    Many thanks!
    BillLin likes this.
  2. ALS

    ALS Super Moderator Staff Member

    Welcome to the board.

    You need to head over to https://www.youtube.com/user/NutzAboutBolts2 and look up Prius.

    They will go over everything that needs to be serviced by 100K miles.

    Great videos on doing the maintenance yourself or at least letting you know if you're getting in over your head.

    At 120K,
    Trans-axle fluid change
    Inverter coolant change along with regular coolant change.
    EGR valve, EGR pipe, as well as EGR cooler probably need cleaning
    PCV valve replacement
    Brake fluid change.
    HV battery fan cleaning
    Intake manifold as well as the throttle body cleaning is also a possibility.

    Seems all the above need servicing between 100K-120K.

    Mendel Leisk, BillLin and xcel like this.
  3. RedylC94

    RedylC94 Well-Known Member

    Welcome! How is your Prius doing as far as engine oil consumption? By that mileage, some supposedly well-maintained 3rd-generation Prii already have a serious problem with that issue, but some don't. What makes the difference isn't clear. Clogging of the EGR system (including the cooler, valve, pipe, and manifold EGR passages) is apparently also common, as hinted by ALS. That can lead to worse problems.

    Yes, changing the tranmission lubricant is probably a good idea, and it's easy. Otherwise, you're probably ok to just follow Toyota's recommended maintenance schedule.

    I don't think there's such a thing as "genuine Toyota" spark plugs, but the original Denso model (or equivalent NGK) would be fine.
    xcel and BillLin like this.
  4. alster

    alster Well-Known Member

    We have a 2010 Prius purchased new in May 2009. Approaching 160,000 miles. I do my own oil changes and change the oil and filter every 10,000 miles with Mobil One 100% synthetic motor oil 0w20 weight. No oil usage at all, 4 quarts out, 4 quarts in. I replace the engine air filter, every 50,000 miles or so.

    I had the spark plugs replaced at 108,000 miles. All 4 looked like they could go another 100,000 miles. I would not change them until at least 150,000 miles. I had not changed the trans fluid at this time. I have had no issues, and I believe with the high quality of the trans fluid used is not a big issue. I may change it myself at 175,000 or 200,000 if I still own the car.

    Also after well over 8 years, and nearly 160,000 miles I have noticed no traction battery issues, the battery still seems to have just has much capacity as when new. The 12 volt battery is still original as well, with no issues
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  5. tallassazn

    tallassazn New Member

    Between city and freeway driving in LA, I've consistently track around 45/46mpg and fill up the tank around 410-420 miles.
    xcel likes this.
  6. Mendel Leisk

    Mendel Leisk 2010 Prius (CAN Touring) Staff Member

    Priuschat is down, so I've come skulking back... Anyway:

    No "probably" about it, more like "absolutely". You'd want to remove and clean the intake manifold as well; it's the final leg of the EGR passage, has ~1/4" ID EGR passages, one per port.

    My 2 cents: there's a strong correlation between EGR clogging and head gasket failure. There are naysayers, but when you have a system that is critical for the engine design, and it's near-completely bunged with carbon, that can't be good...

    When Priuschat is back up I'll come back, post some links.
    xcel, RedylC94 and BillLin like this.

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