I HAVE A 2007 LINCOLN MKX. WITHIN THE PAST 3 MONTHS OR SO, I HAVE HAD 3 DIFFERENT VALVE STEM MALFUNCTIONS (LEAKY STEMS ON 3 DIFFERENT TIRES) RESULTING IN MY VEHICLE BEING DISABLED. THE LAST ONE CAUSING MY TIRE TO BLOW OUT. I WAS TOLD BY A TECH THAT IT WAS THE VALVE STEM ON THE FIRST TWO TIRES SO WHEN MY TIRE SENSOR WARNED ME OF LOW PRESSURE TODAY, I CHECKED MY STEMS. SURE ENOUGH...ONE WAS LEAKING. I WAS APPROXIMATELY 35 MILES FROM HOME AND IT IS CHRISTMAS DAY...SO I AIRED UP MY TIRE AND HEADED HOME. APPROX TEN MILES DOWN THE STREET, MY TIRE BLEW OUT (BEYOND REPAIR). I THANK GOD THAT MY SON AND I WHO WERE TRAVELING ALONE WERE NOT INJURED...BUT WITH THIS BEING THE 3RD LEAKY STEM, I WOULD SAY THAT THERE IS TRULY A PROBLEM WITH MY CONTINENTAL CROSS CONTACT LX TIRES. I HAVE SIZE P245/60R18. *TR