What if you named the Sinclair car Pig? Cause then, it could break down seconds after they've finished doing whatever with it, and Axel can just pat the dash saying "That'll do, Pig, that'll do."
The more I think about this suggestion, the funnier it is to me. There’s your joke, but there’s so many more as well. Sometimes insisting that P.I.G. is actually an acronym, though what it stands for changes every time you ask. Roxas calling it Porky, Babe, Pumbaa, Peppa, Piglet, Professor Strangepork, etc., just to be annoying and contrary. Saix using pointed phrases like “sty” and “pigpen” to describe the interior. Whenever Reno drives it while in uniform, Axel goes “Hey look! Pig in a Pig.” Just the basic idea of someone shouting “GET IN THE PIG” is putting me in stitches. Maybe I’m just too easily amused, idk.