This policy is commonly referred to as a "30-day return policy" or a "no-haggle return policy."
However, this type of policy is not offered by all dealerships, and the specific terms and conditions can vary. If you're interested in returning a vehicle under a 30-day return policy, it's important to carefully read and understand the return policy provided by the dealership before purchasing the vehicle.
Be sure to clarify the exact duration of the return period, any associated fees, documentation required, and any specific restrictions or exceptions that may apply.