High Mileage Transaxle Fluid Change

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Ecologically Speaking, Dec 16, 2019.

  1. Ecologically Speaking

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    I have called Toyota of America. I have called AMSOIL. I have called local transmission shops. I have called local mechanics. No one will give me an answer.

    And so I return to the only true location of information for Priuses. It's good to be back on the Chat.

    My 2008 Prius hit 140,000 miles yesterday and the transaxle fluid was never changed. No transmission issues that I feel. Is it worth changing the fluid now, or is it too late?
     
  2. SFO

    SFO Senior Member

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    The cost is quite low, why not just change it and be done with it o_O
     
  3. Mendel Leisk

    Mendel Leisk 'Orrible Oracle

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    Never too late. Would you be DIY'ing?
     
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  4. borgestes

    borgestes Member

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    Allow me to stir up the crowd. The transmission doesn't have any bands in it, its not like a regular transmission that if you change the oil now it will fail. But there are just gears and bearings, both steel, and magnets in it to collect anything that wears off. Change it if you want, its cheap. I have changed a handful to make me feel better but really your just pretending. It would be fine if you just leave it alone or fine if you change it. BTW I did manage to strip a plug on my 2010, ended up having to use a chisel to get it out. Not a big deal and the plug was like 5 bucks but again, just leave it alone. Clean your battery fan. Replace your rear latch shocks, clean the carpet, all would be more valuable.
     
  5. Mendel Leisk

    Mendel Leisk 'Orrible Oracle

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    What were you using to break it loose?
     
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  6. borgestes

    borgestes Member

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    allen wrench if I remember correctly, its soft. It was the fill plug, like I said no big deal a metal chisel just popped it open and I ran it in enough to hold till the replacement part came in. Now that I think about it, the replacement is still in the glove compartment. Need to put that in sometime. oops! 33.jpg 22.jpg 11.jpg here is a little proof im on the level. I did an engine swap on this lexus, which uses the same fluid and has clutches, but that's not what the prius has. Also the plug I seem to have spaced out. I know I wont be changing the fluid again so its not priority.
     
    #6 borgestes, Dec 16, 2019
    Last edited: Dec 16, 2019
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  7. Mendel Leisk

    Mendel Leisk 'Orrible Oracle

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    Maybe 3/8" Allen key too, which is a little smaller than 10 mm?

    A proper 10 mm Allen key style socket (usually 3/8" drive) is the way to go. They usually come in a set, for maybe $15.

    Use it with a long handled wrench (with reducer if needed) and it's easy. Torque value is 29 ft/lb.
     
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  8. TMR-JWAP

    TMR-JWAP Senior Member

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    Change it.

    I've done "first time" transaxle fluid changes on well over a dozen Gen 2s. Although that's not a LOT, I've seen quite the range of fluid come out. Everything from solid black with the consistency of water to still noticeably reddish and probably good to go.

    Just do it for peace of mind, if for no other reason.
     
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  9. Tim Jones

    Tim Jones Active Member

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    Bad idea not to change the fluid....... I know first hand...... just a suggestion.....
    #10 hex..... never stripped one and I've done it four times.
     
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  10. borgestes

    borgestes Member

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    ok well who has one of these in your back yard. All you guys who have changed out a prius transmission raise that hand up high

    I have :) 44.jpg
     
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  11. TMR-JWAP

    TMR-JWAP Senior Member

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    What failed in the transaxle to require replacement?
     
  12. borgestes

    borgestes Member

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    one too many trips pulling a trailer back and forth from Texas to California
     
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  13. SFO

    SFO Senior Member

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    What was the average mileage between ATF changes?
     
  14. edthefox5

    edthefox5 Senior Member

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    How did you kill that trans blew out a winding?

    Easiest way to kill a G2 trans is to over load the car or trailer than go find yourself a huge mountain and make sure the hybrid battery charge is low and then when the car starts slowing down going up the mountain floor it all the way up like it’s a magic car, that will burn up a motor winding guaranteed especially if the inverter trans coolant or trans fluid has never been changed.

    The trans in a g2 is a technical marvel but it’s achilles heal is that scenario. Super high load with low power. Other than that it’s pretty bulletproof.

    Change the fluid it’s easy just jack the front of the car up as high as you can open the fill bolt first then open the dump bolt and dump it. clean the magnet then get a long funnel you snake from the top into the side fill hole. Put 4 quarts of Toyota WS in it bolt it back up and done deal. Done that 3 times on my 07 so far over the years.

    Good luck.
     
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  15. dolj

    dolj Senior Member

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    That's a funny looking Gen 2 Prius!
     
    #15 dolj, Dec 17, 2019
    Last edited: Dec 17, 2019
  16. Mendel Leisk

    Mendel Leisk 'Orrible Oracle

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    Regarding the 10 mm hex socket head cap screw: Honda keeps it simple; the automatic transmission drain bolts have a 3/8" square recess: a regular 3/8" ratchet wrench is all you need.
     
  17. dolj

    dolj Senior Member

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    That's done it. I'm going to trade in my Prius for a Honda.
     
  18. borgestes

    borgestes Member

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    I bought the car with 200k and I knew it had been pulling a trailer because I got the trailer in the deal. Fluid changes are not going to make you or break you that's all Im saying. Do it if you want, I did it on a couple, a couple I have right now I have not, and they all are running just fine. And all have pretty close to 200k on them. An interesting note is, that tranny replacement cost me 120 bucks with a 1 year warranty out of the local salvage yard. Is that cheap or what? Guess there is not a market for ecvt. This was for a 2010 prius.
     
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  19. SFO

    SFO Senior Member

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    Just to clarify, you were able to blow up a gen3 transmission?
     
  20. Ecologically Speaking

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    My concern is that I might start getting slippage with clean fluid. However last night instead of sleeping I was watching teardown videos of the CVT and it doesn't seem like that would be an issue.

    Yeah, I have a friend that has a shop with a lift I can rent to lift it and do the work.

    Rear latch shocks? Do they need replacement before failure?

    I believe I will. It was mentally tearing, afraid of harming or hurting it by taking either option. It seems that it will either help it or do no harm.

    Indeed from what I am learning of the G2 trans, it is absolutely amazing in the time. Must I use Toyota WS or can I use a synthetic like AMsoil ATF?


    Thank you all for your help!!!
     
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