Q: oil leak around spark plugs on 2003 Jaguar S-Type

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rear spark plugs driver & pass. side have oil in them.
(2) Answers
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Be very delicate and properly torque the valve cover hold down bolts the plastic covers can warp. I use Permatex gasket glue to make sure the gasket stay in the valve cover.
Oil in the spark plug tubes is commonly caused by leaking O-ring seals. These seals are replaced as part of a valve cover reseal. Please use the following link to find the cost to reseal the valve cover(s) on your 2003 S-Type Jaguar -