To know for sure, you MUST check your owner's manual. This will specify the recommended oil type (weight and type - conventional, synthetic blend, or full synthetic) and viscosity (e.g., 5W-30, 10W-30).
Failing that, you can:
* Check the oil fill cap: Sometimes the recommended viscosity is printed on the oil fill cap.
* Look at the sticker under the hood: Many cars have a sticker under the hood that lists recommended fluids.
Without knowing the specific engine, I cannot give you a definitive answer. Using the wrong oil can damage your engine. Always consult your owner's manual or a reliable source before changing your oil.