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Transmission fluid change

This is a discussion on Transmission fluid change within the Kia Forte Turbo Maintenance forums, part of the Kia Forte Turbo Garage category; 28k you say? How hard was it driven? Many WOT from dead stop? Any towing/high mountain? How the ATF compared to fresh one? Mine is ...

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Thread: Transmission fluid change

  1. #21
    PLP
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    28k you say?
    How hard was it driven? Many WOT from dead stop? Any towing/high mountain?

    How the ATF compared to fresh one?

    Mine is at 25k. I was thinking of changing it, but never really came to it. Now I am actually thinking of selling it, though.


    From my previous experience.
    In 2007 KIA Rondo (it was V6, 5spd) the ATF was flushed at 35k. It was really brownish. Not very bad, but definitely not red as fresh one. That was I think in 2011/2012 or so.

    Now, the kicker. Before we sold it at 65k miles, in 2016, the ATF looked still like new.
    It simply seemed like the factory fill did not last as long as the flushed one... maybe additives? Maybe something else was in the tranny, any fluids, sealers that discoloured the original one. Who knows.
    Shifts, though, were almost same. A bit better, but nothing huge.
    drc69 likes this.
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  2. #22
    Senior Member SXTurbo's Avatar
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    Quote Originally Posted by drc69 View Post
    OK so after driving around most of the day (3-19-19) the up-shift was much smoother and a little-bit firmer.
    But the "big" difference (40% to 50%) was the down-shift was very smooth and nice. Before it was not great and it lagged/hanged-up a-bit. NO more.
    For $20 I "will" do this again in a few months, just as easy to do just like changing oil and filter just add another one and a half hours (I take my time) or so on to the days car maintenance.
    Great info drc69. Glad to hear you had positive results. I was going to use SP4-M trans oil but it's around $10.00 a quart from the dealer. Valvoline trans oil is a great deal and if it's working well I'll go with that.
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    2016 SX Silver
    Build Date 4/16
    In Service 2/13/17

  3. #23
    Senior Member drc69's Avatar
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    Quote Originally Posted by PLP View Post
    28k you say?
    How hard was it driven? Many WOT from dead stop? Any towing/high mountain?

    How the ATF compared to fresh one?

    Mine is at 25k. I was thinking of changing it, but never really came to it. Now I am actually thinking of selling it, though.


    From my previous experience.
    In 2007 KIA Rondo (it was V6, 5spd) the ATF was flushed at 35k. It was really brownish. Not very bad, but definitely not red as fresh one. That was I think in 2011/2012 or so.

    Now, the kicker. Before we sold it at 65k miles, in 2016, the ATF looked still like new.
    It simply seemed like the factory fill did not last as long as the flushed one... maybe additives? Maybe something else was in the tranny, any fluids, sealers that discoloured the original one. Who knows.
    Shifts, though, were almost same. A bit better, but nothing huge.
    Car is driven "normal". Sure I do a few WOT here and there. No towing or long distance driving. As I said the OEM fluid didn't look bad at all, but made a positive improvement to the way the trans shifts now.
    I'm not planning on selling the car, no need to replace it for any reason in my book. I bought it "new" and replace the old car ( Mitsubishi Eclipse ) with this one. Which I still Like A Lot more then the old car, not very good at all.
    2014 Koup "SX" A/T Silver. Mods; Tint, 6th EE Delete Pipe, Sylvania SilverStar Head, Nokya Fog, Interior LEDs, Debadge (Forte) Trunk-75A Red Dogbone (one side only) Done.

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  5. #24
    Senior Member drc69's Avatar
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    Quote Originally Posted by SXTurbo View Post
    Great info drc69. Glad to hear you had positive results. I was going to use SP4-M trans oil but it's around $10.00 a quart from the dealer. Valvoline trans oil is a great deal and if it's working well I'll go with that.
    I've used Valvoline for more then 40 years now, so I'm good with that brand. For many years I only used Kendall oil and then when back to Valvoline. The good old days, at lease for me they where. LOL
    2014 Koup "SX" A/T Silver. Mods; Tint, 6th EE Delete Pipe, Sylvania SilverStar Head, Nokya Fog, Interior LEDs, Debadge (Forte) Trunk-75A Red Dogbone (one side only) Done.

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    Senior Member SXTurbo's Avatar
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    Doing some maintenance at 22k miles now and trans oil is on the list. I did 2 drain & fills of the trans oil w valvoline red bottle trans oil. Have to remove the front splash shield & air filter box. Both easy to remove and I left the lower shield off for a few weeks because I wanted to put a few hundred miles on between drain & fills. Procedure is very easy, I leave the fill check plug out for the whole process to vent the trans. Drained out oe trans oil then filled trans until I got a slight drip out of the fill check hole. Started the motor and waited until the fans kicked on. Added more oil until it just trickled out of fill check hole, moved through all the gears then put the fill check plug back in. Old trans oil didn't look too bad, lots of gunk on drain plug magnet. I will say shifts are nearly imperceptible now as the tach just drops going in to the next gear. Going forward I will do this same double drain and fill every 20k miles.
    drc69 likes this.
    2016 SX Silver
    Build Date 4/16
    In Service 2/13/17

  7. #26
    Senior Member drc69's Avatar
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    Great job. I'm at 29K now. I did it once (27K), so maybe in a few more weeks I'm going to drain and fill one more time before summer.
    Working on the head-unit and speakers now.
    2014 Koup "SX" A/T Silver. Mods; Tint, 6th EE Delete Pipe, Sylvania SilverStar Head, Nokya Fog, Interior LEDs, Debadge (Forte) Trunk-75A Red Dogbone (one side only) Done.

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    Junior Member 16SnowWhitePearl's Avatar
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    Ugh...at 43k, now. Had the car at the dealer back in April and asked the adviser about A/T fluid interval. He said he really doesn't use one., because there's a lot of factors that contribute to fluid degradation. They have a way to test the viscosity and if the fluid is holding up, they leave it alone. I was having them comb over the car, because I had just bought it with a hair over 40k on it (Carvana). He said my fluid was good (guess I believe him, because when ISN'T a dealer trying to sell you something). He also ranted on about how clean and in good shape the car was and they wouldn't hesitate to sell it as a CPO vehicle. Seems worth the time and relatively low cost to drain and fill it a couple of times, though.
    2016 Forte5 SX - Bone stock, except for wheels and tint

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    Senior Member drc69's Avatar
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    Hi,
    I'm glad I did the trans, it has been shifting so much better then before I did the drain and fill.
    Cost was less then $25 at Walley World.
    I did the trans at the same time I did the oil change, probably do it again in a few months.
    2014 Koup "SX" A/T Silver. Mods; Tint, 6th EE Delete Pipe, Sylvania SilverStar Head, Nokya Fog, Interior LEDs, Debadge (Forte) Trunk-75A Red Dogbone (one side only) Done.

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    Remove that front lower shield and have at it! Buy 3 jugs of the valvoline trans oil if that's what your going to use. Get a long neck funnel for the fill. I left that lower shield off for a couple weeks in between drain & fills. If you leave it off don't do any highway high speed driving, I did and at 102mph the passenger wheel well plastic ripped off the car. $50.00 to replace it but the experience of it coming off at just over 100mph was pretty scary!
    2016 SX Silver
    Build Date 4/16
    In Service 2/13/17

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