Are classified ads safe?

While most transactions that occur between people using online classified ads are legitimate and safe, taking some precautions before buying or selling goods online is a good way to prevent you from losing your money or valuables.

Is it OK to give VIN number to potential buyer?

That being said, it is perfectly safe to give out your VIN. Its in (essentially) plain sight, just like your license plate. We at Instamotor would argue in favor of sharing your VIN when trying to sell your car, so a buyer can look at the history and know what they are getting into.