cold start smoke.

starting cold,no smoke,well,a little bit of grey,drive a mile to work,restart
after 4 hours,100yds then cloud of light blue smoke,rev to clear,all ok,no more smoke for rest of day, starts well,drives ok,suspect valve stem seals,but,it don`t do it on other days when I go further to work,last time it did it I
changed the breather cos 2yrs ago the turbo was worn & got the blame!
turned out to be the crankcase breather,a new turbo was fitted by my
mates garage anyway,also fitted a new breather in sept cos the smoke
appeared now & again,this seem to cure it,timing belt done in feb,so,it`s
collecting a little oil 3 days a week & burning it,anyone got a clue?

let it develop