Pretty much everything is collectible eventually.

As a rule the most collectible are the sports cars, followed by the convertibles, coupes and wagons, with the wagons last.

Luxury cars are always more collectible than cheaper cars

So far my 1989 Hyundai Excel is not collectible, but by 2060 I am sure it will sell on e-bay for more than the $5,500 it cost my buddy when new...

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Semibodacious Transmogrifications a Specialty

1990 300D 2.5 Turbo sedan 171K (Rudolf)
1985 300D Turbo TD Wagon 219K (Remuda)

"Time flies like and arrow, yet fruit flies like a banana"
---Marx (Groucho)