In the United States, it’s called the department of motor vehicles. It would be pretty weird if almost all motor vehicles lacked motors.
KIA may not agree with that, but they’re also wrong. https://www.merriam-webster.com/dictionary/motor
https://www.dictionary.com/browse/motor
https://dictionary.cambridge.org/us/dictionary/english/motor
https://www.britannica.com/dictionary/motor
Hopefully I don’t need to keep linking dictionaries.
Or, I’ll just keep calling them engines/motors like everyone else does. Also, I am a car type.