It's an essential item on the early cars.
The early design of PCV Oil Seperator tended to clog, increasing the block pressure to the point where the oil couldn't flow from the turbo, leading to turbo bearing failure.
Silver F21 M135, Man-box, Heated Seats, HK, Adaptive Dampers, Black Panel, BBS CH-R's, Eibach Pro Springs, Drexler LSD
Please help the Mod's by using the Report Button [ ! ] where appropriate