Q: What needs to be replaced to fix oil in the spark plug chamber on 2004 Infinity FX35?

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i changed the spark plugs today and there was oil inside the spark plug chamber on the plugs closest to the firewall on both sides. what needs to be replaced and how much would it cost to fix these oil leaks? It would seem that the valve cover gaskets are leaking...would you agree?

My car has 114000 miles.
My car has an automatic transmission.

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