A 1955 Oldsmobile 88 in all but name, the Stanier '55 is the pre-order bonus car for GTA 6, and it also appeared in the first trailer. The Stanier nameplate stretches back to the Vice City era. Game files list rear-wheel drive, five gears and about 1,900 kg, sensible numbers for a big mid-fifties sedan.
The Stanier '55 is a pre-order bonus: reserve GTA 6 before launch and the car is included. Rockstar has not said whether it becomes available to everyone later, so if you want it guaranteed, the pre-order is currently the only known route.
It also shows up in Trailer 1, so the car exists in the world regardless of how you order the game.
The community companion for Grand Theft Auto VI. Database, maps, guides and tools for Vice City and the state of Leonida.