Put mine in a few days ago, engine cover was and will be no problem as I'd removed it a few days after getting the truck. I prefer my engines to not 'heat soak' so I pulled it to allow better cooling after shutdown. Only a few hundred miles so far, so I haven't opened it up yet. But taking a road trip to view the upcoming lunar eclipse, so that will be a few thousand miles I'm sure, so I can report back after that. I will say after ~5600 miles there was just the smallest trace of oil residue in the PCV piping, and most of it seemed to be on the end closest to the intake rather than the end closest to the PCV valve, which I found a bit surprising.