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Civics like to leak from the oil pan, valve cover, and cam seal. You can see oil leaks from the valve cover and cam seal from the top of the motor. If you've got grime build up on the bottom of the oil pan, with drips, that is a sign of an oil pan leak. To be sure I would go with Fat Charlie's idea and clean the engine bay very well so that you can see where oil starts to leak from.
Does your oil stay pretty clean after 3000 miles? If you can't see a leak on the dipstick after 3000 miles, it's not much to worry about. I've got a small leak somewhere, probably the oil pan. I don't get oil in the driveway, but when I change the oil I notice grime build up on the oil pan, and a small drip of oil that has found its way to the lowest point of the oil pan. It could also simply be the drain plug washer, as I have never replaced it.
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