Originally Posted by italyix
Mike, when I took mine in to the dealer for a misfire, a PUMA case was opened cause they could not figure out what was causing this. Turns out the computer recorded an over rev of 12k rpm (from previous owner) and a broken valve spring was causing the misfire. Even BMW was skeptic about the over rev, but car (knock on wood) still runs fine.
If you are ever down in the socal area, please let me know. I want to read that for myself. Will only take 2 minutes
If 12K rpm only gets you a broken valve spring then these things might as well be bulletproof!!