Smokey. Blowing white/blue smoke.

Found the initial start is ok, then starts blowing smoke and gets worse when revving the engine.
A reconditioned engine was fitted 5000km ago at another workshop after initial engine failure. An initial inspection found very little crankcase pressure, and no blowby from breathers into the intake. The turbine housing was flooded with oil. Replaced suspected failed turbo and blew out oil return to sump and found smoke cleared up with driving after new turbo fitted. The customer returned after a short period with the same issues and turbine housing again full of oil when inspected, very little crankcase pressure and no oil blow by in intake pipes.