after a run out yesterday i noticed im getting alot of smoke on overrun, it smells oily and is a bluey colour, engines 2.0 zetec turbo having only covered 800 miles since full rebuild. turbo is a t28 but is second hand so could it be the turbo or am i looking at something a bit deeper. the turbo isnt watercooled so i know they can give bluey smoke when seals are failing but i am literally leaving a fog on overun. it doesnt smoke at all on start up or when driving just when engines on overrun