On the 3.9L V6, 5.2L V8 and 5.9L V8 the Oil leaks commonly from the valve cover gaskets, intake manifold gaskets (front and rear), timing cover gaskets, distributor O-ring, and the rear main seal area. Using fluorescent engine oil dye can be helpful in determining the source(s) of the oil leak.
Average mileage: 151,166 (51,000–264,000)
Engines affected: 3.7L V6, 3.9L V6, 4.7L V8, 5.2L V8, 5.9L V8
18 people reported this problem
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Leaking behind rear main seal
4.7l leaking oil behind the timing cover
I had no oil leaks from the engine until I decided to change to Mobil Oil's New "High Millage 75k Plus" Full synthentic oil. I knew full well that I would maybe see new leaks after switching to synthetic as I have with most engines after switching to syn oil. I did this only to get the most miles out of my aging high millage engine. Now I am planning on replacing the valve cover gaskets and O Ring on the distributor.
all the same leaks