PULLED OUT OF PARKING LOT ONTO THE HIGHWAY 29 IN LIBERTY HILL AND WENT OVER A OIL SPILL ABOUT A GALLON OF OIL.AFTER GOING OVER IT, THE VEHICLE LOST TOTAL CONTROL OF STEERING AND WENT TO THE LEFT SIDE OF THE ROAD .THE STEERING SHOT TO THE RIGHT, AND COULN'T MOVE THE WHEEL. VEHICLE RAN INTO THE DITCH AND HIT A TREE. DRIVER'S SIDE AIRBAG DIDN'T DEPLOY. DRIVING SPEED 40 TO 45MPH EVEN ROAD.TOOK THE VEHICLE 4 TIMES TO THE DEALER FOR THE SAME PROBLEM, AND HAS NOT BEEN FIXED. *AK