Review on Ensun Crankcase Vent Valve Oil Separator Kit: BMW N52 E90 E91 E60 E61 E85 E86 Replacement #11617531423 by Devin Jirsa

So I bought an 06 330I with all sorts of problems and had no experience with BMW. I struggled with CEL codes and idle issues and replaced many parts. I did a smoke test and found open circuits in the CCV system. A kit that would have been perfect for my car cost about $400, so I ordered this kit knowing I wouldn't be using a Y-hose. Luckily the hose on my car was the only hose that was intact. My car was built on August 5th. Everything about this kit fitted perfectly except the hose that goes to the oil pan had 2 o-rings and I tried everything to get the hose attached. Removed an O-ring, unfortunately without success. Removed both and it showed up immediately. CEL is off so I assume there is no vacuum leak. What really happened is the CCV was bad for so long it leaked oil into the convectors and then the car threw codes for the rear O2 sensors saying cats are bad. I added the O2 extensions and that solved my problem. I destroyed 1-3 O2 cylinders trying to get it out. FYI, Spray penetrating oil for a few days, then use a small adjustable wrench and a 5 pound hammer! None of the fancy O2 tools worked. Or set up sensors. But yes, great CCV kit!