The oil drain plug on a 1994 Ford Mustang is located on the
bottom of the oil pan. The oil pan is the large, somewhat flattish metal part underneath the engine. To be more precise, you'll find it towards the
front of the oil pan, but you'll need to get under the car to see it clearly. It's usually a fairly large bolt or plug.
Important Note: Before you attempt to drain the oil, be sure to consult your owner's manual for the specific location and any warnings or special procedures. Always use proper safety precautions, including jack stands and proper draining containers.
