I took my ST in for an oil change and tire rotation on 10/18. I then drove the next day at highway speeds with no issues at all. Fast forward to yesterday and I noticed a bad vibration and slight wheel shake at highway speeds. I called into the Ford service department and asked them if the tires were rebalanced and they said no then proceeded to tell me that this can be normal and the issue can correct itself over time during a "break in" period. I have put roughly 150 miles on it since so I find that hard to believe especially since there was no issue whatsoever a day after at highway speeds. Any thoughts or has anyone else experienced this?