Always check your owner's manual for the definitive recommendation. The manual will specify the weight and type of oil (conventional, synthetic blend, or full synthetic) that Ford recommends for your specific vehicle and climate. Using the wrong oil can lead to engine damage.
While 5W-20 is often cited, some owners might use 5W-30, especially in hotter climates or for heavier-duty use. Again, refer to your owner's manual for the correct recommendation. The manual will also specify the oil's API certification (like SN or SM).