Is there a 3-day cooling off period in Oklahoma when you buy car?

No, Oklahoma does not have a "3-day cooling-off period" for car purchases. Once you sign a contract to purchase a vehicle in Oklahoma, you are generally bound to the terms of that contract and cannot simply cancel it or return the car within a specified number of days. Some dealerships may offer their customers a voluntary cooling-off period as a courtesy, but this is not required by law and not all dealerships will have such a policy in place.