Would it be rude to ask my grandma if I could have her car?

My grandma has a nice little Nissan that just needs a new tire and about $200 of body work. She's 75 and doesn't drive anymore and it bugs me to see a nice little car sit and rot away. My cousins always ask for her to write things in her will for them which I don't think is right but I feel rude asking for something big like that. The only thing I've ask for from my grandma was my grandfather's Buck knife. I feel greedy asking for something like that but I don't think I should, my cousins ask for her land, money, house and her coin collection which is worth about $20,000.