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Automatic transmission fluid change

Bat21 Jun 18, 2017

  1. Bat21

    Bat21 Well-Known Member Supporter I am in morocco

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    Did an transmission fluid change today. Decided to do a drain then refill then a second drain to try and get as much of the old fluid out.

    I was only getting about 4.5 litres out despite leaving it drain for a couple of hours. I realise there would still be some in the box and torque converter but now having read the manual I see the capacity is 15 litres :flushed:

    So going by that I have only effectively replaced a third of the oil :angry:

    How do you guys do an autobox oil change?
     
  2. Gary820

    Gary820 Well-Known Member I am in great_britain

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    I go for drain, fill, drive then repeat, had to do it a few times when I got water in the box. Did have the sump and oil cooler off at one point too but was mostly clean.
     
  3. t1pper

    t1pper Well-Known Member I am in uk

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    I swap out 4.5 ltrs anually it has kept my fluid looking nice and fresh.
    Last time I dropped the sump and replaced the strainer and cleaned the magnets, everything was very clean with nearly no build up of debris even at 200k miles.
    I believe you can have a complete system flush to replace all the fluid but I am happy with my routine.
     
  4. guyc

    guyc New Member I am in great_britain

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    Would using a Pela or similar extractor get more out?
     
  5. Bat21

    Bat21 Well-Known Member Supporter I am in morocco

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    I think this will be my strategy from now on.
     
  6. Chas

    Chas Well-Known Member I am in england

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    When my box got water in it we went (Clive and I, well mostly Clive:clap:) for drain, fill, drive then repeat, IIRC it was 5 times before the milkiness disappeared
     
  7. Chris

    Chris Super Moderator Supporter I am in europe

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    If you follow the schedule and only replace that which drops out, that IS the procedure. It's a refresh really not a replace. It's all that's required. I did mine this weekend too and swapped the throttle cable at the same time.

    You can't physically drain the entire system unless you take the torque converter out and tip it up. The amount you'd need to put through it to flush it out completely would be considerable. It would probably involve connecting something to cooler pipe system that goes to the rad and pump fluid round.
     
  8. Bat21

    Bat21 Well-Known Member Supporter I am in morocco

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    Thanks again folks.

    I think I will do a drain and refill of the gearbox once a year to keep it in as good a condition as possible.
     
  9. t1pper

    t1pper Well-Known Member I am in uk

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    Do not forget if you want to be really pro active clean/swap the strainer.
    It will surely give you an idea as to the overall condition of the box if you examine any debris found on the magnets and strainer.
    Mine was thankfully spotless so keeping going with the regular swaps makes sence for me.
     
  10. Lorin

    Lorin Well-Known Member

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    I did this and it was a considerable amount of ATF. I found a gearbox specialist with the pump that connects to the cooler pipes. Because I wanted to replace the ATF with Transmax Z that is fully synthetic, they first rinsed out the old ATF with 25 litres of cheaper fully synth ATF. Took it for a drive. Then used 25 litres of Transmax to complete the fluid change :flushed:

    Did I notice any difference......? Nope, but I am hoping it helps extend the life of the box.
     
  11. Chris

    Chris Super Moderator Supporter I am in europe

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