My Prime's first transmission fluid change :D

Discussion in 'Prime Care, Maintenance and Troubleshooting' started by thatoneraccoon, Feb 9, 2017.

  1. JimboPalmer

    JimboPalmer Tsar of all the Rushers

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    The Big Sleeze

    Professor John Kelly from Weber State found a document that states the engineers thought it had a 100,000 mile Oil Change Interval.

    Owners often find the first change to have the most wear. I advise drain and filling the ATF WS at 30,000, then 100,000 then every 100,000 miles. (This is just some guy on the internet's advice)

    There are those here who experiment with other brands, but you know Toyota ATF WS works. (You will also need two aluminum gaskets at the dealer, if you are DIY)

    If you have already exceeded 100,000 miles, no problem. The old wives tales about ruining your transmission by changing ATF too late, concern parts your transmission does not even have. (wet clutches and hydraulic logic bodies)

    I would not compare your Prius transaxle (transmission and differential in one unit) to other transmissions, it is not a Torque Converter Automatic nor a Belt and Cone CVT. Since it does not have a Torque Converter, it does not need a flush, just drain and fill.

    The simplest for me of Prosessor Kelly's many videos is


    The most detailed for your 2020 is
     
    #161 JimboPalmer, Jan 4, 2020
    Last edited: Jan 4, 2020
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  2. srivenkat

    srivenkat Active Member

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    Especially at such low mileage, I wonder if the factory fill has some special additives that make it appear dark. Has the darkness of the fluid been correlated with the condition of the fluid via UOAs?
     
  3. bwilson4web

    bwilson4web BMW i3 and Model 3

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    Does it smell burnt?

    Bob Wilson
     
  4. Mendel Leisk

    Mendel Leisk Sand Pounder

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    I changed ours around the one year mark and 10K miles; it was definitely darker, significantly so. Later changes, at longer interval, were progressively cleaner. My take is that a brand-new transaxle is harder on the fluid, or at least builds up a lot more debris, due to gears meshing, manufacture residues or whatever.

    I've no regrets about an "early" change, seems to avoid the transaxle "sitting in stale bath water" for countless years.

    I'll take a possibly superfluous fluid change over a UOA any day.
     
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  5. edthefox5

    edthefox5 Senior Member

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    Its dark because that's gear wear-differential wear. The majority of that gear wear happens at the first 5,000 miles maybe less.

    The op will find all subsequent trans fluid changes to be drastically cleaner. In fact on my bought new 07 G2 I changed my trans fluid at 5K miles and it looked identical to his bottle color.
    Then again at 35,000 miles and it was 100% cleaner. All the break in fluid was out of there.
    At 75,000 miles it was a waste of time and fluid it looked perfect. I don't use WS I use an after market D6. I have trans UOA's in the G2 Trans stickies.

    I would say the OP is good to go for the life of the car trans wise. Good job. Very little wear will happen from here on. if you really want to change it again go 50,000 miles first.

    As far as contaminated fluid the same if not more goes for the Inverter coolant loop. The break in for that loop is much harder on that fluid then the trans fluid. It goes through raw aluminum channels and is easily contaminated by that aluminum. Again one change now will be good for the life of the car. I went through the same cycle with inverter fluid on my 07. Its all about that break in.

    You will notice a jump in mileage with fresh inverter fluid. I did. Its the most important fluid in the car performance wise & mpg wise.

    before you change it make note of the behavior of the fluid in the reservoir. Look at what it looks like with the car in ready. How aggressive is the circulation. If you change the fluid correctly you may see increased circulation. More flow in that reservoir. I did.

    Toyota discovered that the G2 with its combined Inverter/Rad coolant chambers in the same rad box was not working well enough so the G3 and on has a separate coolant radiator away for the rad. No heat soak no cross heating. Made big difference plus there was the added heat load of the higher powered motors so much bigger Inverter coolant heat load than the G2 sees.



    .
     
    #165 edthefox5, Oct 1, 2020
    Last edited: Oct 1, 2020
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  6. DOHCtor

    DOHCtor New Member

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    My brothers Volvo used an Aisin AW55-50 transmission that was notoriously prone to shitting the bed at around 250k km mark.. the reason? No tramsmission oil changes. Volvo, it appears, specs JWS3309 (Toyota T-IV) as a fill for life fluid. No Toyotas ever specs that fluid as a fill for life and no Toyotas ever had problems related to the fluid when it's changed at the specified interval of 96k km.. Volvos, it appears, are fine too when the fluid is changed in a timely manner..
     
  7. DOHCtor

    DOHCtor New Member

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    Just a heads up. I changed my ATF at 10k km. Was sightly dark but bulk WS costs next to nothing for us anyway at work. Also changed engine oil and pourred a can of Liqui Moly Ceratec in there. Engine is smoother, hard to quantify how but it definitely is..
     
  8. dtsexpert

    dtsexpert Member

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    atf change at 10km? darn go green..you re wasting fuild that should be lasted for entire lifespan of the car...
     
  9. Prodigyplace

    Prodigyplace Senior Member

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    Not really if keeping all that startup grit shortens the life of the car.

    Many people here have done early changes like that and had a sample of the removed fluid analyzed revealing it was a good idea to change it.
     
  10. dtsexpert

    dtsexpert Member

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    Definitely go extra miles just to safe is fine, but my thinking is the same the below post on the 1st page of the topic.

    "The owners manual doesn't mention changing the transmission fluid until it is at 60k miles under extreme driving conditions. If it is contaminated as soon as 2k miles, why don't they mention changing the fluid as early as 2k miles? I am thinking that following their recommended schedule would be good. Just trying to understand the extreme differences in maintenance schedules."
     
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