I was looking under my hood tonight and my uncle who is a diesel HD mechanic noticed what looked to possible be oil at the top of the intercooler tube at the back of the engine. It is an 08 LMM with 30700 Kms on it. Is this something that is normal? I also noticed on the left hand side of the engine an area that has a square shape to it, sorry I do not know the name...I am thinking EGR?? It too has the same dirt/oil residue on it. I could take pics tomorrow and I am sure this would help. I think I will take it to the dealer any way to have it looked at.