WHILE DRIVING 70MPH ON A HIGHWAY, MY KIA SOUL SPONTANEOUSLY BURST INTO FLAMES UNDERNEATH A STRANGER STOPPED WITH A FIRE EXTINGUISHER LUCKILY. FIRE DEPT SAYS HAD WE NOT USED THE EXTINGUISHER, MY CAR QUITE LIKELY WOULD HAVE EXPLODED. PRIOR TO INCIDENT, I HAD NO WARNING LIGHTS ON, NO OIL LEAK, OIL NEEDED CHANGING SOON BUT WASN'T TOO LOW. THERE WAS NO COLLISION.