Your first test drive was from your dealership to your home? Sounds like you are lacking experiencing in purchasing a vehicle.
Prefer buying from a new car dealership, what they consider junk and not worth fixing goes to the auction where used car guys think they can make some money off these things.
Really bad is private parties, will tell any kind of lie to get rid of the darn thing.
Dealerships around here will let me take the car for three days, before I sign that dotted line. They do charge a little more, but once you are aware of the huge parts cost, a heck of a lot cheaper to pay that money up front. Even a lot worse if you have to pay 90-200 bucks an hour for some kid that doesn't even know what he is doing to repair it.
Going to vehemently disagree with my fellow board members.
DO NOT OPEN THE HOOD, DO NOT TAKE IT BACK!
Call the dealer and have them pick it up, for all you know, some idiot didn't properly install that oil filter cap that can cause an engine fire taking your life.