I bought two kia's
Well, it's NOT a good idea. (unless you REALLY know what you're doing)
Generally, HMG GDi engines are crap.
Read the fine print of the warranty VERY closely, have all the service receipts and make sure they include all the required services as per the owners manual.
Forum member @MrBob owns two larger KIAs made in recent years and they've been rough.
Especially with 'initial reliability' https://carkiller.com/scottykilmer/qa/that-sinking-kia-feeling/
And note the importance of very frequent service: https://carkiller.com/scottykilmer/qa/stopped-burning-oil/
Looking at the models you've picked out, you should've gotten a Sienna and Camry.
I'm not biased against them, I personally own Kias, I've had Hyundais - I just know what powertrains to get and what cars to not even touch at all - sadly the GDi are in the latter category.
2023 kia carnival EX
It's the V6 GDi these engines that can get troublesome after 100k miles.
But, if you service them frequently and correctly, these can last quite a bit more.
So replace oil every 5,000 miles at most (monitor oil condition and quantity).
The 8 speed conventional automatic is half decent,
So far I've only herd of one that had issues and even then it only ended just needing a TCM reset.
Replace ATF every 25k-30k miles (it's a 'lifetime fluid' but if not replaced said lifetime is short)
And also it's important to check that during highway / long drives ATF does not exceed 185 F (85 C)
2024 k5 gt line
This one is NOT a good choice.
The 1.6 T-GDi engine is crappy even by T-GDi standards.
Here you really want to replace the oil very frequently (much less than 5,000 miles)
If it's not serviced frequently or driven hard, it can fail very early on.
But, note that your's is lucky a GT-Line and not a GT - so you still get a somewhat decent tranny.
we sold a 2014 santa fe sport, 1owner with 54,000+ miles on it for $11,000/carmax
we also sold a 2014 toyota corolla eco, 1owner with 64.000+ miles for $10,600/carmax.
we used those funds to purchase the kias above for and out of pocket total of $64,269 for the both of them.
WOAH WHAT!? How much???
Do you mean 85 grand for 2 Kias!?
That's bad considering they depreciate like crap and are not worth that!