Hey guys, I'm really interested in learning about the common problems on the 4 mk1 motors. I know the SPI has valve seat problems and premature timing belt failure, The SVT ZTEC has running belt problems, and the Duratec has rod bearing failures. And I heard the early ZTEC's had problems but I'm not sure what. Can anyone add to the list? A thread with common engine problems would make a great sticky.