Question: what questions to ask when buying a car from owner?
Answer: Why are you selling the car? (Private seller) ... 
How long have you owned the car? ... 
Who did you buy the vehicle from? ... 
Where did you purchase the vehicle from? ... 
What's the condition of the car? ... 
Can you describe the vehicle's appearance? (Private seller) ... 
How much mileage is on the car?