Porosity in the rear of the engine block can cause oil leakage around the rear engine cover. Porosity may be found at rear of the engine and the repair procedure in the service bulletin describes using RTV silicone sealant to fill the porosity. There is also an updated rear engine cover for when porosity is found on the gasket mating surface.
Average mileage: 156,000 (156,000–156,000)
Engines affected: 4.2L 6 Cylinder, 5.3L V8, 6.0L V8
8 people reported this problem