What GM W-platform car was offered until 2002?
GM W platform:  Originally code named GM10, it began development in 1982 under Chairman Roger B. Smith and debuted in 1988 with the Pontiac Grand Prix, Buick Regal, and Oldsmobile Cutlass Supreme coupés. Sedans followed for 1990. Pontiac Grand Prix: The Grand Prix was a line of automobiles produced by the Pontiac Division of General Motors from 1962 through 2002.
Pontiac Grand Prix