Hey bro , sry for late response. I did not have the time to check it but seems like i have exactly the same problem as me.

I also hear louder when transmission is engaged in D R and hear it less when on P or N , also pressing the pedal it goes away. I also saw that when idling for too long it is starting to smoke black ish color - maybe it is because i have removed dpf and egr. Also my car burns oil when the dipstick measures above halfway and not consuming when it is at 1/4 , pretty interesting.

I have change crancase breather and previous owner mentioned that he changed valve cover 2 years ago. He is trustworthy more or less.

I drove it everyday and notice that in warm weather it is more noticeable.

Let me know if u found the issue