Oil in Spark Plug Hole
1.8 L 4cy, dual cams, 4 valves/cylinder
Oil is leaking into the no. 1 spark plug hole. (The other 3 are dry and clean.) Was checking the car over and found that the no. 1 spark plug hole was half full of engine oil. All the valve cover bolts were tight, and as far as I know, the valve cover has never been removed. (It's my wife's car.) What's your opinion - where is the leak and what is required to fix it?
I have an idea what I need to do, but would like to have the opinion of others who may have dealt with this problem.