MY CATERA CYLINDERS IS FILLED WITH OIL.
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1998 Cadillac Catera Question: OIL LEAK
Answer #1patrick mannion from Greg Solow's Engine Room, April 14, 2010, 01:31Master
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.