The steering wheel would oscillate wildly in a 2" arc at approx. 60mph. Kia knew the problem but hid the answer from me. They had the dealer replace multiple tires, I bought new tires, the dealer swapped parts from side to side to no avail. This went on for weeks until a friend at Kia USA told me it was a common problem and required Michelin Pilot tires to fix. All this time Kia USA knew the answer but were too cheap to fix it. When I finally confronted them about the Michelins they offered to install them if I signed a release absolving them of all responsibility for the vibration. I told them I would pay for the tires and retain the right to sue them if it didn't fix the problem. They relented and installed the tires. About 98% of the vibration went away and I can live with that until my 2 year lease is up and I can return this POS!