I have a1997 pontiac GrandAm, motorsize a 2.4 dual cam that is dripping oil badly

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my grand am has a major oil leak. I don't know if i should call it a leak because the oil comes out steadily like a really fast drip or a light pour. EXAMPLE: I could lose a quart of oil within 5 minutes of the car idling. It seem to be coming from the back of the motor, somewhat higher in the back of the motor, did a visual and can't see where the oil is coming from. Had an oil change done before this and it was overfilled by a HALF-A-QUART of oil. UNKNOWING we used it 20 miles and the oil light started to flash. Checked the oil, it was almost all gone. had to add 3 quarts. It still runs good after this, but I got this bad oil leak. Did a seal or gasket blow? Did the overfilling of the oil cause the problem? HELP! Please give an idea where the oil is coming from.