I started to change the spark plugs on a 1998 Ford Contour LX with a 2.0L Zetec (4-Cylinder) recently. It's got just over 100,000 miles on it. According to the service schedule, they're due at 100,000 miles. I removed the plastic cover on the valve cover and pulled the plug wires to access the plugs and was surprised to find oil pooled around two of the plugs.
I suspect this is not normal /expected. Where is the oil coming from and what do I do to stop that leak?