You have a stuck or leaking valve that is letting oil into the cylinder when it sits. You need to have the Engine serviced and possible the Head repaired.
I had the same issue along with a loud whistle noise which usualy started only after driving the car hard for a few minutes or when the engine heats up.Both these 2 problems were solved when I had the intake manifold gaskets replaced.
Have you checked your oil lately? is the oil milky in colour? are you low on antifreeze ? if so have someone check your head gasket and valves a.s.a.p
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