oil in spark plug well on 1998 Chevrolet Tracker

when tuning up and changing spark plugs, I found oil in the spark plug well. Guessing this means a ring job. What is the estimated cost for this repair?

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3 answers
valve cover gasket
Definately the valve cover gasket , Just had to do it to my 'Rolla
Oil in the spark plug well if these spark plugs are recessed down a well in the valve cover would indicate the valve cover gasket tube seal gasket is bad. Oil on the spark plug/in the combustion chamber would indicate an internal engine problem such as worn valve guide, worn piston rings.