I have a slight oil weep on my 2.4l defender at the junction of the Air intake manifold (plastic one) and the MAF sensor housing tube (steel one). Now I am not sure where this oil could be coming from. I think there is a seal between the 2 pieces and I have tried tightening the 2 joining bolts up but they are tight. Perhaps a new seal or reseating the seal might solve the weeping problem but where is the oil from. Thanks if anyone can assist.