Review on JDMSPEED Engine Valve Cover 11127570292 Replacement - BMW 335i, 640i, 740i, X3, X5, X6 by Greg Princeking

I ordered this to fit my customer's 2014 F10 N55. Just 21 days after installation it had an internal fault right on the brake booster line connector. I couldn't believe it and it's causing the AFR engine light to be too lean. I'm an experienced German car mechanic and I've done a number of tests (smoke, sensor check, reset, clear adjustments, etc.). Couldn't find the cause of the engine fire, but I know there's a leak somewhere. It wasn't until I had to remove the intake manifold that I was lucky enough to see the problem after disconnecting the brake booster vacuum line on that valve cover. It was just oil all over that port, it should be pretty clean but I suspect it's an internal diaphragm or some other structure they taped to that valve cover. I immediately wrote a message to the seller, now I'm waiting for him to correct the situation. So I'm leaving two stars for now. One star for the essentials and another star for such a good price. However, no other stars can be provided unless they come back to fix this problem for my client.