The other thing I forgot to mention was the main bearing knock (wrist pin knock, or rod knock...I don't think anyone is quite sure exactly what it is) that occurs between 1500 and 2,000 rpms (give or take) I don't believe it was extremely common, but an unlucky few (including myself) have it. It has only been an issue with the F22 engine as far as I am aware...but the F23 is essentially the same engine, so take precaution. I first noticed it at about 80,000 miles when I was reving the engine via the throttle cable. I could not only hear the knock, but could also feel it through the cable plate. It has not worsened or caused any further problems that I know of. If not mistaken, there was a TSB released. If anyone has further information, please share.