I just got back from my dealer and had one of my pistons replaced. I have 1200 miles on my F7 and it seemed to be running fine. I went in for the oil adjustment bulletin and asked them to check for scuffing. One side was toasted they said because of the lack of oil. So even if you think your F7 is running fine make sure you or your dealer check them! Are there many others out there that have had to replace theirs?