"What? No, not the mustang. That's-- That abomination is beside the point. I mean Frank. I look like him, I sound like him. Or he looks like me. I don't know. But that means he was an Impala before, right?" Follow his logic here, Tuck. Baby's not crazy.

He also doesn't like the idea of moving on. The Winchesters have literally been his whole life. Dean was conceived in Baby, which sounds weird, but is fact. Baby's been there for nearly every pivotal point in Dean's life. He wants to be there for every pivotal point to come, too.

"Maybe that's easy for you because you're human. I'm a car. I've only got one purpose. I've only got one interest."