OIL LEAK on 1998 Cadillac Catera

MY CATERA CYLINDERS IS FILLED WITH OIL.

Asked by for the 1998 Cadillac Catera
The spark plugs are down a well in the center of the valve cover on top of the engine. When you remove the spark plug wires to replace the spark plugs, if you find oil in the plug well tube or on the plug wires the valve covers need to be removed to replace the spark plug tube seals.
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