1984 Cadillac DeVille - Oil consumption

The “roadster” was an appearance package added by the dealer consisting of a fabric roof covering and Roadster lettering on the C pillars.

Yes, I got that, see my previous comment.
Really poor choice of name from the aftermarket people.
A roadster is a convertible, usually a two seater. Pre-war roadster often had rumble seats. The post 57 T-Bird “roadsters” utilized a fiberglass cover for the rear seat.

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