Annoyance...

[eastofeden]

It is a good question to ask - but the answer is difficult.

My advice - if you like him or love him enough - let the car thing go. He may have a passion for it and if you talk him out of it he may end up resenting you for it. 

So - the real answer is inside of you. Would it be a dealbreaker for you? There is no shame in knowing yourself and what you can or can't handle. It is always a bad idea to go into any relationship with the idea we can change the other person.