MY 2013 KIA OPTIMA HAS HAD DIFFICULTY REMAINING IN A SRAIGHT LINE ON THE FREEWAY. TENDS TO PULL LEFT AND RIGHT. THE RATE OF TRAVEL IS APROX. 45-65MPH. THERE IS ALSO A PROBLEM WITH "OVERSTEERING" WHEN I ATTEMPT TO RETURN TO THE CENTER OF THE LANE. I HAD BEEN DRIVING MY OTHER CAR FOR 29YRS, AND I ASSUMED THAT NEWER CARS MAY HAVE BEEN DIFFERNT, SUCH AS BEING MORE SENSITIVE WITH STEERING. I HAVE ALMOST HAD A COLLISION ON THE FREEWAY BECAUSE THERE ARE ALSO BLIND SPOTS IN SEVERAL AREAS OF THE KIA OTIMA. THIS TIME I DID END UP IN COLLISION BECAUSE OF BLINDSPOTS AND OVERSTEERING IN ORDER TO AVOID HITTING THE CAR NEXT TO ME, AND INSTEAD HIT THE CAR NEXT TO ME ON THE OTHER LANE WHEN I ATTEMPTED TO MOVE OUT OF THEIR WAY THIS OCCURRED FROM SENSETIVE OVERSTEERING. OUR AIRBAGS DID NOT DEPLOY. BEFORE THIS ACCIDENT, I HAD RECEIVED A LETTER FROM KIA STATING THEY WANTED TO KNOW IF I WOULD LIKE TO TRADE UP TO THE KNEW KIA OPTIMA. THE EMAIL STATED THEY HAD NEW FEATURES; SUCH AS CAMERAS FOR BLIND SPOTS. THIS MADE ME AWARE THAT KIA KNEW THERE WAS A PROBLEM WITH THESE SERIOUS .BLINDSPOTS. THE CAR WAS ALSO BEGINNING TO RUMBLE, AND I BELIEVED IT WAS COMING FROM THE ENGINE,IN FACT QUITE SURE IT WAS FROM THE ENGINE. I ALSO HAD RECEIVED A LETTER IN THE MAIL FROM KIA, STATING THEY WERE HAVING PROBLEMS WITH THE ENGINES FROM CERTAIN YEARS OF THE KIA OPTIMA MY CAR WAS WITHIN THE YEARS STATED. IT STATED THEY WOULD HONOR THIS PROBLEM IF YOU KEPT THIS LETTER IN YOUR CAR, WHEN BRINGING IT IN FOR REPAIRS. I WAS