[ErroneousBosh]

They need coolant for the battery and motor which degrades, and they need oil for the gearbox.

I guess you're in the US, where "lifetime oil" is a thing. Expect the gearbox to be scrap once it's a little outside the warranty period.

[Schiendelman]

Based on your attitude I now can't tell if you're being led astray or if you're actively attempting to lead others astray. Here's a set of guidelines for that vehicle, which do not remotely align with your claims:

https://www.wilsonkia.com/service/service-tips/kia-niro-main...