Back again with more problems lol , I've been recommended a decent mechanic locally who I'm going to see soon but before I do is there any way of distinguishing between valve stem oil seal or turbo oil seals in regards to a smokey ride ? Only does it when hot and after I've lifted off the pedal . I've had a brand new head fitted recently so I'm guessing it will be the turbo but I had some issues during said work on head so could do with double checking before I pay out again , £2850 spent in last few months so I wanna hedge my bets if possible . Cheers guys n gals . P .