Can't find a short story about a guy who bought an expensive car, and it's really bothering me

It was about a guy who worked in a car dealership, saved up a lot of money and bought an expensive car. Doesn't follow break-in procedures and wrecks the engine in a street race. IIRC it was by a famous sci-fi author, I thought maybe Kurt Vonnegut but I can't find it in his bibliography. Came back to me because I saw the manufacturer Isotta-Fraschini in the CM newsletter and I think the only other place I've seen it is in that story, I didn't even know if it was a real manufacturer.

Other details I can remember:

- The protagonist had a weird name

- The story takes place in a vacation town, maybe on an island?

- The car had an Italian name I'd also never heard before, likely fictional, had "marino" or "marina" in it IIRC?

- In the end someone at the dealership says that all the car's value is in the engine

I think someone on here may have linked it to me.

Read it in high school!  Doesn't the protagonist (can't remember name exactly but believe it is with an "M") just walk away from the car after it breaks, too?  I can't put my finger on the title or author...

I would read it...even if it were just to be pissed at the protagonist.

I remember thinking the protagonist was an idiot and commenting about that, most likely on here, but I tried searching for my own comments about it too.

Kurt Vonnegut from the book "The Bagombo Snuffbox"

I believe the story was called "The Powder Blue dragon"

One of my favorite collections of short stories ever and I really recommend it to everyone.  Ok, gotta stop before I completely geek out.

http://blog.modernmechanix.com/the-powder-blue-dragon-kurt-vonnegut-jr/

^WINNERS!