Not too loud, but I can hear it when car is parked with engine running. Anyone else get this?

 

i do. it sounds like a washer rattling on a bolt. I think its coming from inside the tranny but not to sure.

 

I can't resist, but by any chance do you have an after market oil fill cap?

 

Nope. Stock

 

Maybe the catalytic converter heat shield is rattling - when the car is cold, get under it and see if you can jiggle the shields?

 

I ask because it is a common issue to find that the oil fill cap has vibrated off and will fall between the block and the firewall, at which place it will rattle around until it is fished out with wire. It would sound like something loose behind your dash.