My car has a GT25R turbo fitted which was rebuilt about 30000miles ago along with the pistons.
However, I'm getting blue smoke from the exhaust when the car is warming up and stationary. Temp will be about 45-60degrees coolant and it seems a fair bit from exhaust but I'm using barely any oil. Otherwise, other than a poor cold idle (suspect iscv) and the turbo overboosting, the car seems fine and drives fine. Am I likely to be looking at ruined turbo or pistons? The turbo has a blue tinge to it and defo has oil seeping through the seals and I read if the pistons were leaking the car wouldn't run barely.

Advice please?