I hear loud enough “clunk” right after start up when engine is warm, or after about 3 min when cold. Happens only once per start up. It bothers me a lot, especially since the car is new. Is this normal by any chance? I’m taking it to my dealership in 2 days and want to be prepared if they say “it’s normal”. It comes from this PCV (at least that’s what I think it is). Please, help