In GTA 5, unlocking new cars at the Diamond Casino can be an exciting challenge. Players can spin the Lucky Wheel daily for a chance to win exclusive vehicles, including rare sports cars. Additionally, completing specific missions or participating in in-game events may grant access to unique cars. Keep an eye on the casino's weekly updates, as new vehicles are often introduced. To maximize your chances, ensure you visit the casino regularly and engage with the various activities available, from poker to slot machines, to enhance your gaming experience and unlock coveted rides.