this comes from a girl with a car mom and has dated car guys all her life. you need to sit down and tell her how much it means to you to work on your car or help your friends with theirs. maybe ask her to come once? maybe to watch or even help? get tools or what not. [i loved watching being there], just to involve her and show her how much it means to you, some girls really just dont... get it unless you show or tell them but if thats your time then you need to explain that to her reaction will be everything. if she wants to be involved great but if she does the ever infamous its your car or me? then thats your answer because if a girl cant respect something thats not really a hobby its a way of life then that shows she cant possibly respect how you live your life or you. girls will deny it to their dying day but thats what it comes down to.