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Thread: Tranny fluid change

  1. #1
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    Mazda 3 06 Hatchback

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    Tranny fluid change

    I own a mazda 3 06 hatchback sport 2.3l. I bought this car about a year ago with 145k, currently at 152k, did a oil change soon after, and have been curious on the whole tranny fluid change thing. The thing I'm referring to is not replacing it itself but if the previous owner never changed the fluid would it hurt me to change it now. It's still reddish which I understand to be good. (my knowledge includes yt videos, my slightly mechanical friend, and alot of forum reading). I've heard that the old deposits may break free and can cause cloggings and issues. Now let's say you guys(generalizing not being sexist, haha) say I shouldn't because of deposits. Don't take this next part to seriously if it sounds really dumb, I'm just trying to figure out what's possible and what's not. What if I, or had someone else, probably not me, but myb a family member could help, removed the transmissions or wherever the fluid is kept, and kind of cleaned it out after removing the old fluid and before putting in the new, so if there is deposits they wouldn't clog anything, or is it better to flush is, replace filters and check for clogs in places, if that's even how it works, and leave it on the whole time. Again my knowledge is limited, so might just be random talk.

  2. #2
    2008.5 MGM MS3 rsvinylgraphics's Avatar
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    In your case you should probably just do 2 or 3 drains and fills of the transmisson fluid.

  3. #3
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    Mazda 3 06 Hatchback

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    Thanks for the reply, I'll probably end up doing that at some point.

  4. #4
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    For what it's worth, my girlfriend bought a 2007 Mazda3 S with an automatic transmission last year. It had 120,000 miles on it. I went through and did a lot of maintenance given all the fluids other than motor oil looked neglected. I not only drained the Automatic Transmission Fluid but dropped the transmission pan, changed out the filter and gasket, cleaned the magnet, and filled it with synthetic ATF. There is a method of draining the torque converter via a hose to get more of a complete "flush" too. It shifts significantly smoother now. While flushing a neglected transmission may put you in risk (probably statistically small) of a clog, the logic of neglecting it further is flawed to me. You didn't buy the used car just to have it for a short duration until powertrain failure from neglect, did you? I think taking care of it properly is better insurance for longevity.

    Also, if the ATF is neglected, it's very likely that the power steering fluid, brake fluid, and coolant are all likely past their change interval too. They all certainly were for the Mazda3 I'm working on.

  5. #5
    Registered Member concept's Avatar

    2014 Mazda3 S GT auto, 2008 MX5 6-speed

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    I agree with both replies. Leaving the old fluid alone is the worst option, in my opinion.
    2014 3S GT, Deep Crystal Blue, Eibach Pro-Kit, Enkei PF01s, Koni Sports
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  6. #6
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    2011 528i & 2015 Mazda 6

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    you arent going to damage your transmission by changing fluid unless you are at very, very high mileage. that is more of a myth then anything else. you will always do more good then bad by changing transmission fluid.

    be very sure that you change the transmission filter as well. otherwise, may as well not even waste your time...

  7. #7
    Registered Member ceric's Avatar

    2016 Mazda6 iGT, 2014 Mazda3 sGT hatchback

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    Drain and refill. No flushing the tranny if the fluid has not been changed for a long time.
    2016 Mazda6 iGT + Tech Pkg
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  8. #8
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    2011 528i & 2015 Mazda 6

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    Quote Originally Posted by ceric View Post
    Drain and refill. No flushing the tranny if the fluid has not been changed for a long time.
    no! this is simply not true!!!

    you know what people have done a full transmission service with over 150k miles on their transmission and never ran into an issue right! that is 100% a myth.

  9. #9
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    Mazda 3 06 Hatchback

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    Thanks for the opinions, I will have my mechanic take a closer look and see what he says, I'll probably end up flushing it out.

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