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2015 Kia 2015 Kia Optima LX
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Hello, I have been slacking with my 2015 Kia Optima. I bought it with 20k miles about 4 years ago. It currently has about 135k miles and I have not touched the transmission. Should I drain and refill the transmission fluid? Should I change the filter? Any help would be appreciated.
 

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2011 Kia Optima
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There is no serviceable filter, so just drain and refill and you'll be good to go. Although these transmissions are pretty durable it's always good to give it some new fluid, albeit 4-5 qts, just can't remember quantity I used,.but did use Valvoline MaxLife synthetic atf.
 

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Hello, I have been slacking with my 2015 Kia Optima. I bought it with 20k miles about 4 years ago. It currently has about 135k miles and I have not touched the transmission. Should I drain and refill the transmission fluid? Should I change the filter? Any help would be appreciated.
Just make sure you put in the same amount you got out!
 

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2013 Ebony SXL Turbo: Original Everything @ about 189K with Drag wheels.
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2011 Kia Optima
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The only problem with refilling with the amount that has been removed, one never knows if the trans was full before draining.
 

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2018 Kia Optima
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The only problem with refilling with the amount that has been removed, one never knows if the trans was full before draining.
LOL this is especially notable given that AFAIK these Optimas don't come with a tranny fluid dipstick...
 

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2011 Optima
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Doesn't it have a fill plug on the side? Don't you fill it til it slightly drips out a little from there? Is the valve body vertical? The instruction state that it should flow out slightly, so I'm assuming that it is
 

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Just remember a drain and fill doesn't drain the entire trans so you need to do it 3 times to replace most of the fluid, driving a few miles between changes.
 

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2013 Kia Optima
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Doesn't it have a fill plug on the side? Don't you fill it til it slightly drips out a little from there? Is the valve body vertical? The instruction state that it should flow out slightly, so I'm assuming that it is
You can do that with a hose connected to a funnel but there is a fill hole in the top that you remove the big plastic bolt and fill very slowly using a funnel.
 

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2011 Optima
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You can do that with a hose connected to a funnel but there is a fill hole in the top that you remove the big plastic bolt and fill very slowly using a funnel.
So ,fill from the fill hole on top, and just just watch it flow out the side and that should be good?
 

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Here is a good video on the process for a 2012 Sonata. There are different ways to re-fill. If you plan to re-fill from the top, I think the overflow plug needs to be installed.

 

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Its not a hard thing guys lift the vehicle so that its level. Drain, and measure how much youremoved and refill with the same amount. The vehicle must be level. When refilling place a catch pan under the side over fill plug (remove it) because some will come out. I typically get around 4 liters out. The hardest thing about this is getting the vehicle level and removing the plastic belly pans. Takes me about one hour and I only have 1 arm.
 

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2011 Optima
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What I ddid on a Camry before, is disconnect the pressure line to the cooler and put in in the drain pan, had someone turn the engine on till the line started to shoot a little air, turn it off,add oil, do the same. I kept doing the same procedure til it came out Red like the oil that I kept pouring in. Never had a problem with it and ALL the fluid that came out was dirty Brown oil. I'm wanting to do this, too on mine.
 
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