If there is no visible leak when it is parked, then it is leaking while you are driving (when the engine is pressurized), leaking through seals. Go over the engine bay from the top and from the bottom and try locate a "wet" area. Clean the are with a can of brake cleaner, wipe it clean. Drive the vehicle for a day or so, and re-check the engine bay. If you find wet area, then you know it is leaking through that area. Usual culprit is the front and rear main seal, or camshaft seal. (If it is leaking through the seal).
Monday, March 9th, 2009 AT 1:26 AM