However, generally speaking, for older 3.0L Ford Aerostars (assuming it's not a newer, significantly modified engine), you'd likely find recommendations for:
* Conventional oil: A 10W-30 or 10W-40 weight oil was common. Again, check your manual.
* Oil type: Likely a standard motor oil, though some later models might have specified an energy-conserving oil. The owner's manual will state this clearly.
Never rely on general advice for motor oil. Using the wrong oil can severely damage your engine. Consult your owner's manual for the correct viscosity (like 10W-30) and type of oil specified by Ford for your specific year and model Aerostar.