Sorry for bumping this older thread. This was a very informative post! I recently was told to look into the PCV system because I had a strange issue that happened.
In the video linked, I had noticed a slight whining sound when under throttle. It’s pretty subtle and would happen every time I drove. The reason why this is interesting is because 2 days ago I was getting a complimentary oil change done at the dealership and they told me my valve cover gasket was leaking. I had them replace the gasket and cover. Ever since I picked up the car, the sound is now 100% gone... do you think there is any correlation??
Check out my video:
Thank you in advance!