My New yorker is doing the same thing..Try the timing belt cover gasket. Between the timing belt cover and the front of the motor. $10 part but $300/labor unless you can take 1/2 the car apart. Also the oil pan gasket has to be replaced which means the motor has to be lifted. Hope this helps. Let me know. Im in the process of having mine fixed now.
Check the engine oil level, power steering fluid, brake fluid level and transmission fluid level prior to driving your car. Place a sheet of clear paper under your car's engine to determine what type of fluid is leaking. (It could even be coolant/antifreeze.) Engine oil will be light brown if fresh to darker black, power steering fluid and or transmission fluid will e more red in color (perhaps dark if it has not been changed in a while). Brake fluid should be amber if fresh perhaps darker if not flushed periodically. To pin point where oil is leaking from the engine may need to steam clean the engine first. Starting with a clean engine and then running the engine it may be easier to identify specific leaks. If the oil leak can not be identified, florescent dye may need to be added to the oil and the engine run for a while. After running the engine the dye used has florescence in the dye is visable under UV light and it helps pin points the source of the leak. Identify the color of the oil to differentiate wether the oil leak is steering fluid, brake fluid, or transmission fluid and try to identify the location of the fluid leak under the vehicle, ie front of engine compartment, rear of engine compartment , passenger or driver's side of vehicle.