I was looking under my hood today and noticed that the driver side front most spark plug wire looked very soiled with oil. Further inspection showed that fluid, looks like oil has also dripped down onto the exhaust manifold directly underneath. It is only that one side in that one area that is dirty every other plug and area looks clean, could this be a failed gasket? I don’t seem to be loosing any more oil that usual, 2 ticks down from full after 5000K. Performance seems as usual and there are no strange sounds or hesitations.

My truck is a 98 ML 320 with 196,000KM on it (123,000Miles).

Thanks in advance for any help or suggestions on this.

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1998 ML 320
BIG Sound