The bottom nut on the exhaust manifold is leaking an oily substance down the side of the engine onto my Altenator. I have been loosing oil lately. About one quart each 350 miles. I added some UV dye to the oil. When I shine the light on this oily substance it did not glow. The number one injector has also had some diesel pooling next to it lately. I think it may all be connected together somehow. Hopefully not a major fix. Anyone have this situation before?