There are oil on a spark plug and spark plug boot.where are the oil come from? what cause it?

2009 FORD FALCON
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MICHELLE0061
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I find a spark plug and boot with oil when I change spark plug for my car
Dec 11, 2011 at 11:10 AM
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RASMATAZ
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Check the valve cover gasket and seals
Dec 11, 2011 at 11:20 AM
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MHPAUTOS
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Common problem, just replace the rocker cover gasket and ensure that the plug access seals are also replaced.
Dec 14, 2011 at 10:14 AM