Never buy a car made after 1980 if you have to buy a newer car, never buy a car made after 2001, or 1997 if you want a Cadillac...
Amen on no Cadillacs made after 1997...
I made the mistake of buying a 97 caddie only to discover that the Vortek engine, while a pretty awesome piece of technology, likes to crack head gaskets and eats oil like most cars eat gasoline. I hear they worked those problems out after a few years, but I am not buying another Cadillac just to find out if it is true.
All cars are made of plastic.