I OWN A 2007 LINCOLN MKZ WITH MICHELIN ENERGY MXV4 TIRES DOT NUMBER B90A NNHX 0207 WHICH ARE ORIGINAL EQUIPMENT ON THE VEHICLE. DURING NORMAL OPERATION IN THE LAST 6 MONTHS I HAVE EXPERIENCED VALVE STEM FAILURES ON 3 OF THE 4 ORIGINAL TIRES LEADING TO A SEVERE AIR LEAK AND IN TWO INSTANCES DAMAGE TO THE SIDEWALL OF THE TIRE. IN EACH CASE THE DAMAGE WAS REPAIRED BY REPLACING THE TIRE AND/OR VALVE STEM AT A LINCOLN DEALERSHIP. THE DEALER, FORD MOTOR COMPANY, AND MICHELIN REFUSE TO ACKNOWLEDGE THAT THERE IS A PROBLEM. *TR