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Why is there oil pooled around the spark plugs on a 2.0L Zetec in a 1998 Ford Contour LX?

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 ...