External oil leaks from the valve cover gaskets, intake manifold gaskets (front or rear), and the rear crankshaft seal area are common. The rear main seal is an unlikely source. Normally, leaks in this area are from the bearing cap mating surfaces as well as the sealing surface between the oil pan and bearing cap.
Average mileage: 117,250 (78,000–150,000)
Engines affected: 4.7L V8, 5.2L V8, 5.9L V8
12 people reported this problem