Mazda Protege

I have a '93 Mazda Protege 1.8 liter 4 cyl with 140,000 miles. It has a severe oil leak that's coming from somewhere either directly behind the passenger side tire or in the vicinity. I was just wondering what may be causing this leak. Other than going through about 6 quarts of oil a week, it runs fine. There's no abnormal smoke or rattling noises. I just recently had the alternator replaced and I know it needs a new timing belt. Could you giving me any ideas on what may be leaking?
Zavarian tal
November 20, 2007.

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