Change the transaxle fluid!!

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by James1964, Oct 1, 2018.

  1. James1964

    James1964 Member

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    #1 James1964, Oct 1, 2018
    Last edited: Oct 1, 2018
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  2. TMR-JWAP

    TMR-JWAP Senior Member

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    I used the correct Amsoil full synthetic ATF.

    Boy, oh boy. You have no idea of the can of worms you just opened.................

    This thread will probably explode over the next couple days.........
     
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  3. James1964

    James1964 Member

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    Going to delete then. I don't want the attention.

    Posted via the PriusChat mobile app.
     
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  4. TMR-JWAP

    TMR-JWAP Senior Member

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    No need for that.

    Everyone has their own opinions about transaxle fluids on the Gen 2 Prii. It always makes for interesting reading...

    The amsoil website actually shows two blends they have available for the Gen2 and even specify a 3.8 quart initial fill. Maybe they've updated their testing, or I'm just really far behind (which is the more likely option)
     
    #4 TMR-JWAP, Oct 1, 2018
    Last edited: Oct 1, 2018
  5. Dxta

    Dxta Senior Member

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    Amsoil? That's terrible dude. You're supposed to use Toyota WS transmission fluid in there.
     
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  6. jzchen

    jzchen Senior Member

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    Worms, explosions!!! Exploding worms???

    Getting my popcorn for the show!
     
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  7. Aaron Vitolins

    Aaron Vitolins Senior Member

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    I love how people think Toyota WS is something special. It's an old outdated basic fluid for tons of cars. The powersplit device doesn't really care! I'd use a full synthetic.
     
  8. James1964

    James1964 Member

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    Thanks man. My mechanic, who also builds and raced superbikes recommended Amsoil. He has replaced multiple g2 prius trannys and isn't a believer in the toyota stuff.

    Posted via the PriusChat mobile app.
     
  9. exstudent

    exstudent Senior Member

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    Absolutely, do what you want. It is your car and money, esp. since the car is no longer under warranty. However, auto makers could deny warranty when non-approved fluids could have led to the failure in question; this would be their take on it.

    How much was the Amsoil per quart? Hopefully it was far less than Toyota's ATF-WS, at $7.49/quart for me.

    Total Gen2 (2004-2009) sales in USA = 748,646 units
    Toyota Prius family US car sales figures
    upload_2018-10-3_17-16-30.png


    How many Gen2 transaxles did he replace?
    DIVIDE that number by 748,646 = Percentage of failed transaxles he has touched.

    For shites and giggles, lets say he has replaced ten units. 10/748,646 = 1.335744797941884e-5 (.000013357) Thats a very small number!
    What this number means is for every 100,000 Prius made, 1.3 transaxles will fail.

    Ask your buddy if the failed transaxles he replaced, was the ATF ever changed on those units? If no, I'm sure he, you, and I, would all agree that most likely contributed to the failure. No lubricant lasts forever as you know. Unfortunately, Toyota does not lists the ATF change as a maintenance item.

    You should read this study by Bob Wilson and Professor Denenberg, on ATF oil analysis. They came to the conclusion that changes are REQUIRED. No later than 30K miles for initial, then every 60K miles. Transaxle oil, recent analysis | PriusChat
     
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  10. James1964

    James1964 Member

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    The title of my original post is the only message I totally support 100%: if you don't know when your g2 fluid was last changed, change it! The dreck that came out of ours was like tar mud and stinky! I can't believe it didn't fail 75k miles ago.

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  11. exstudent

    exstudent Senior Member

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  12. James1964

    James1964 Member

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  13. Mendel Leisk

    Mendel Leisk Sand Pounder

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    I don't understand the need to "believe" in a fluid, lol.

    Toyota says clearly to use nothing else, or risk damage. Nowhere else in the manual are they as emphatic, though it does get close with the coolant.

    You may be absolutely fine with an alternative, but that doesn't factor into my equation: if Toyota says I shouldn't use anything else, I don't argue or second-guess them.
     
  14. James1964

    James1964 Member

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    Seems like the most meaningful truth on this subject is that the tranny fluid does need to be changed and isn't good forever as some believe.

    Posted via the PriusChat mobile app.
     
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  15. Mendel Leisk

    Mendel Leisk Sand Pounder

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    I'm with you on that. (y) First change pretty early too, then stretch it.
     
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