I had my turbo redone had the new cartridge fitted and balanced. de-cat the exhaust and rewrote the soft wear. so the ECU does not see the cat. but i'm getting a lot of oil in the boost pipes. it seems to stem from the breather valve . have you had any issues with the valve before. or is there something else i can look into.

 

What year and model?

 

Its a 2006-7 xc60 with a 5D engine