Hmm. Curious about that. I went to the brown valve years ago and have never had fuel in my oil after the addition of the catch can. However I've always seemed to have a rough idle with it. But PCV really has nothing to do with idle, which sensor is pulling the pressure or vac reading due to this smaller orifice?This can totally be in my head but ever since I threw on the brown pcv valve into my 2011 the truck never felt right. I performed many kam resets etc and nothing changed. Power actually seemed to go down. So I dug deeper.
I gathered some very information from a Ford Technician regarding the tsb and what changes it made. He states these engines are very sensitive to changes. On the brown pcv valve for the updated ecoboost, Ford actually reduced the size of the hole for crankcase evacuation to decrease the amount of blowby going back into your intake. But what they failed to mention was that reducing the hole increases crankcase pressure. With this change required them to reflash the trucks ecu. While they were at it they reduced the amount of fuel used on start up to warm up the cats to aid fuel dilution.
He recommended to anyone with a 11-12 to stick with the black pcv unless you have the tsb performed. He said not all trucks exhibit the fuel in oil issue and that most that were affected were in wet/cold climates.The amount that goes through is presumably compensated for in the ECU somewhere. If you change the calibrated orifice , the compensation probably adjusts just fine - but some trucks behave different than others. 13+ trucks must use the now standard brown pcv valve as with any newer ecoboosts.
Ever since I heard that I threw the black pcv back in and my truck was back to normal.