I have an 06 and I notice that I’m having to add a quart every 1000 miles or so. It doesn’t really smoke and I had the PCV valve replaced when. I had the motor replaced last year. Also, when I went to pull out some of the spark plugs today for inspection, I noticed a little oil in the spark plug holes where the threads are. Does that sound like a valve cover gasket leak? Do you think my PCV maybe going bad? Please tell me that it’s not an internal engine problem.