You must have caught someone in a good mood that day at the dealership! There's not too many places who will do that, especially if the cause ends up being something other than the car's fault. I'd stay with them; they treated you well. But, I agree with the others to a point. The dealers will try and get every nickel and dime out of you when they can; but remember, they have to charge for their time, just like anyone else would for a service.