I have just had my turbo fully re-built at Midland Turbo at a cost of £470.
I fitted it 2 weekends ago & all was fine, no more smoke

it had literally done less than 200 miles, when I had the shock of my life - billowing blue smoke again on cold start & hot idle!

& a smell of burning oil in the car -exactly the same smell as before it was re-built
I followed all the re-fitting guidlines, both from the guide on here & the guide they sent with the turbo - this included priming it with oil & cranking the engine until full oil pressure was achieved before starting.
Also had not driven it hard.
The coupe is mapped & de-catted & I told them this & included all the information in a covering note & they assured me that it would be re-furbed to a spec suitable for the modifications.
So obviously I need to phone them up no & explain what's happened.
I have no underlying problems at all with the engine (obviously to my knowledge)
Any ideas what could have happened? - could the de-cat have blown the new seals?.
I'm assuming, if it is the new turbo they will sort it out on Warranty - after just 200 miles use!