Can I use this expression to ask what kind of car does someone own? Or would it be considered a rude question?
You can ask someone "What do you drive?" to ask them what car they own if you are having a conversation about your cars. If you are not having a conversation about your cars, asking someone "What do you drive?" could be rude because the other person might not know why you asking that question. If you want to randomly ask someone about what car they own, you can say "What kind of car do you own?" and explain why you are asking that question. Ex: A: That's cool that you like cars! What do you drive? B: I drive a Honda. What do you drive? Ex: What kind of car do you own? I want to buy a new car, so I'm curious.