 I purchased a 2016 KIA Optima EX. Initially, I was very pleased with the car but the mechanical issues have changed my opinion. The car proved unreliable as the engine stalled multiple times and at times would not accelerate. The car's operation was dangerous having stalled while doing 70 mph on the interstate! I took the car in for service on 4  occasions, each time assured that "the problem is taken care of". The last time it stalled, I had it towed to the dealership and told them I thought the car was a lemon, I was scared to drive it and I wanted to trade it. So, I did for a 2017 Optima EX. It now has 22,000 miles on it and the same thing has started with the new vehicle!!!!!!!!!!!!! I called the same dealership today and spoke to the service department and was told once again "we  have never heard anything like this". I said that is not true, you heard it from me about 7 or 8 months ago! So, here I go again...