BMW dealer. Compression test is what lead to the disproving of their previous assessment that my engine was shot. That was from me scoping the cylinders myself and only seeing one scratch on one cylinder out of the 4 I had checked and then asking what they were going off of to say it was no good. There was never a single code thrown up to the time it finally went under the wrench. I'm going in tomorrow so they can explain very slowly to my why all of this is happening.