have a 2002 v6 chevy s10. leaks oil through one of the spark plugs. what causes this and how do i repair it?

2002 CHEVROLET S-10
12,000 MILES
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GOCHEVY123
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blows black sooty substance out of rear tailpipe when starting. Uses about 1 quart of oil every hundred miles. Never sees oil on ground. Seems to be leaking through a spark plug.
Jan 3, 2012 at 12:48 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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