Got Snail 2

My friend just boosted his ls it is a brand new motor he has a blox series mani and a tial waist gait and a garrett gt32-55 turbo, when you first start the car it runs fine then when u start to drive it it runs fin untill you drive it for more than a mile it starts to smoke and there is oil in the exhaust like a lot... then when u look at the turbo there is oil in the inlet of it he just sent it out like 2 months ago to get resealed but it is doing this any one have any ideas...