Failing that, you can:
* Look at the oil fill cap: Sometimes the recommended oil type is printed on the cap.
* Check the oil dipstick: Similar to the fill cap, it might have a recommendation.
* Consult a mechanic or parts store: Provide them with the vehicle's year, make, model, and engine size (this information is usually found on a sticker inside the driver's side doorjamb). They can look up the correct oil type for your specific Grand Caravan.
Don't rely on general advice online – using the wrong oil can damage your engine. Always refer to your owner's manual or consult a professional.