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Q: cause or suspected reason for oil inside sparkplug wire receptacle through cover on 1990 Geo Prizm

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
pulled the sparkplug wires and the number one wire was literally drowning in oil(one closest to oil fill cap) the other three were dry and seemed fine dont know if this was from an internal problem or spill from the outside inspection i would say the oil is coming from an internal source to my knowledge no oil was spilled or other from the top
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You really need to do the valve cover gasket with the spark plug o-rings as soon as possible, or you will be replacing the cat do to engine misfire.
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