The Stanier is a Vapid four-door sedan that underpinned GTA IV's Taxi and Police Cruiser before appearing as a named civilian car in GTA V and GTA Online, and it is due to appear in Grand Theft Auto VI. Its in-game lore paints it as the archetypal 1990s cab and cop car, discontinued after reports of exploding fuel tanks.
Vehicle data via GTA Wiki (Fandom), CC BY-SA 3.0.