id be here all night explaining it mate but believe me iv had so many cossies and rebuilt so many engines that if its not the turbo it will be the bottom end..
If it was valve stem it would smoke on start up etc and would be different to when backing of the throttle and suckin up the oil past the rings,when you go back on the throttle it will blow a puff clear then come back on when you throttle of then the whole process will repeat itself...not a good explanation but thats the best i can explain it...


cheers danny