2015 OPTIMA SXL WITH 130K MILES REGULARLY MAINTAINED WITH ALL HIGHWAY MILES. WHILE TRAVELING ON THE HIGHWAY AT 70 MPH, CAR BEGAN TO MAKE A MILD KLANKING SOUND. SLOWED THE VEHICLE DOWN AND SHORTLY THEREAFTER, A LOUD BANG OCCURRED UNDER THE HOOD AND ENGINE LOST ALL POWER. PULLED OFF THE ON THE SHOULDER AND ENGINE COMPARTMENT WAS ON FIRE. THE ENGINE AND A FEW OTHER LIGHTS WERE ON. LUCKILY, I WAS ABLE TO GET OUT OF THE VEHICLE WHICH CONTINUED TO BURN. THE CAR IS A TOTAL LOSS. NO PRIOR SOUNDS OR NOISES SUGGESTING A PROBLEM. ALL KIA UPDATES OR MAINTENANCE NOTICES WERE HANDLED BY A KIA DEALER. THE VEHICLE WAS PURCHASED NEW AND HAS BEEN WELL MAINTAINED WITH ALL OIL CHANGES AND MAINTENANCE DONE BY A SHOP. HAVE HAD NO MAJOR PROBLEMS WITH THIS VEHICLE AND THIS IS NOT ONLY A SURPRISE BUT A CONCERN AS THIS IS MY SECOND KIA (PRIOR ONE IS STILL OWNED).