My new V6 2003 4runner has a minor oil leak at the driver's side valve cover, where the oil fill tube extension meets the valve cover. I've checked the two flange nuts for tightness and they are snug (I don't want to break anything by overtorquing). It appears to be a metal to metal interface. There's even a little "lip" below that catches the weeped oil.
Is this common?
What do you suggest?
TIA