my mate that di the interim service used 5w 30 oil which I think is the right one....he said its highly unlikely the tappets but it is definately a mechanical tapping the same as tappets like an older engine just sounds doesnt sound liek you would expect

any ideas ?

as i said it does seem to be hesitant also buthtat could be plugs and leads etc just hate the cvh sounding head ! haha