First I would need to know if the leak is visible. Is it leaking on the ground where you can see it, or is the level getting low and you have to keep adding it? If it's leaking on the ground you need to find the exact spot it's leaking from and not just where the drip is. Sometimes the liquid travels and the leak is in a different spot than the drip. If you don't have a leak on the ground then most likely it's being burned. In that case you may need a new head gasket. You would see white smoke coming out the tailpipe if this is the case.
You should always take your car to an ASE master technician. To find one in your area, go here:
〉 Answered on Nov 21st, 2006 by Lori Johnson, Owner and Instructor at Ladies Start Your Engines