My brother pulled a plug out and it was covered in oil.
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A fouled spark plug is a common issue with modern vehicles. Thinner oils are used to reduce friction and increase fuel economy. These thin oils in combination with a vehicle with higher mileage will cause oil to seep past the sealing ring in your engine. This results in oil reaching your spark plugs and fouling the plug. I would have this spark plug issue inspected by a certified mechanic to see where any repairs are needed.
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