Sentra by Nissan.  Bought one shortly after I got married, but the ex got it in the divorce, and I did like the car.

LLAP,
Swim

I guess it would have to be an Infinity.

would say

Corvette,, bitchy red
but ...
too hard to mantain,,, so I
go Camry

I had to do a Google search to find anything other than GM or GMC, and the only thing I was able to find that started with G was a "Geely" a cheap Chinese car that I wouldn't be caught dead in.

 
So that said, I am going to cheat a bit. Cadillac is a GM product and one of my favorite cars that I ever owned was a Cadillac XLR-V supercharged hardtop convertible. My secretary/SB used to call it my "Batman Car"

Rolls Royce, of course

Who am I kidding. An old 1990's Ram truck off CL probably. My cars same as my providers. No, not necessarily old but cheap.  
Lick Lick

But I really never would own another one after they ran that diesel scam.  If I had never known, that might have been one thing, but once you find that out, it's over.  One could argue that they still are capable of making good cars, but if I found out a provider was calling her friends right after a session and laughing about how I fell for every one of her fake feel-good tricks, well, I probably wouldn't return to her either.