To start...
there should never be a knocking sound coming from any engine, especially an S54.
Something is very wrong with this engine if you are getting knocking sounds - guy probably abused the car. The fact that this douche (
yes I'm calling him a douche because of how he treated that poor poor M3) wouldn't answer your questions regarding rod bearing issue should say something. (
two red flags)... then he wouldn't allow anyone to get a PPI on this car (
3rd red flag), and states he's not going to drive the car anywhere (probably can't hence the knocking sounds from his broken engine)
4th red flag. Way too many things wrong with this picture....such a waste of a good car too.
