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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; Yes, Valvoline Maxlife. $23 at Wally World....

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Thread: Transmission fluid change

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    Member atlsud's Avatar
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    Yes, Valvoline Maxlife. $23 at Wally World.
    2015 Forte5 SX

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    Senior Member drc69's Avatar
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    Nice job. I don't think anyone ever mentioned the (fill plug) under the OEM air box.
    Thank you for the info / pics.
    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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    I didn't even realise we had a fill point...i thought it was sealed!

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    My F5 only has 17k so not ready for ATF change. But I will share what I learned from my Sorento with 127k.

    The Sorento transaxle does not require service unless leaking according to the manual, but after about 100k the shifting was getting more whiny at higher rpms so I decided to see if the ATF could be changed. Turned out to be easy to do and similar to the Forte process seen in this thread. Used about 3.5 quarts Valvoline max life full synthetic ATF.

    The new fluid eliminated the whining and makes for slightly smoother yet firm shifts. Like new again. Note that the drain plug has an aluminum crush washer that is larger diameter than what is used on the motor oil drain plug. So be sure to replace the washer with a new one.

    The ATF drain process leaves about 2 qts of old fluid in the Sorento transaxle so I am going to do a second drain and fill soon, so that about 90% of the fluid will be new.

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    FYI, Penrite Multi Vehicle ATF FS works wonders, and it SP-IV compatible. Its actually used in the Kia/Hyundai dealerships over here.

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    Senior Member drc69's Avatar
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    I did the drain / fill on the trans today. 28K miles fluid looked not to bad but I think it was a little low base on what came out and what I put back in. I measured everything in and out.
    Did engine oil and filter. A little pass do but the weather has been cold for me. lol
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    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 drc69's Avatar
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    Sorry about the pics. I thought I resized them I guess I was wrong.
    SXTurbo likes this.
    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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    Quote Originally Posted by drc69 View Post
    Sorry about the pics. I thought I resized them I guess I was wrong.
    What trans oil did you use? Notice any difference?
    2016 SX Silver
    Build Date 4/16
    In Service 2/13/17

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    Senior Member drc69's Avatar
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    Quote Originally Posted by SXTurbo View Post
    What trans oil did you use? Notice any difference?
    I used Valvoline Max Life (Full Synthetic) Red Bottle 1gallon. About $18 at Wally World.
    I bought an extra qt. but I didn't need or use it. I haven't driven it a lot yet so I don't know. I will today
    an see if I notice any real difference.
    SXTurbo and PLP like this.
    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 drc69's Avatar
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    Quote Originally Posted by drc69 View Post
    I used Valvoline Max Life (Full Synthetic) Red Bottle 1gallon. About $18 at Wally World.
    I bought an extra qt. but I didn't need or use it. I haven't driven it a lot yet so I don't know. I will today
    an see if I notice any real difference.
    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.
    PLP and SXTurbo like this.
    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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