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Subaru- Oil around spark plug boots

2001 Subaru Outback, 2.5L, 4-cylinder, 79.500 miles

I changed the spark plugs. On three of the 4 cylinders, when I pulled the wire boots out of the plug " tubes" there was motor oil around around the boots and seeping down into the tubes. Only one of the plug boots was completely dry and I see a seal surrounding the tube.

I cleaned all oil from the tubes before replacing the spark plugs. Can I try to tighten down on the valve covers or should I replace the seals? I know that I can't allow the oil to build up around the plugs. Any suggestions? Thank you.
July 4, 2006.

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