Spark plugs filled with engine oil can cause engine misfires and performance issues. Here's a breakdown of the common causes: - Worn or Damaged Valve Cover Gaskets: - Function: Valve cover gaskets seal the valve cover to the cylinder head, preventing oil from leaking out. - Cause: Over time, these gaskets can degrade, crack, or become brittle due to heat and age. - Effect: When the gasket fails, oil can seep into the spark plug wells, leading to oil-fouled spark plugs. - Worn or Damaged Spark Pl
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