1stTimeRX350Owner

Hi, I'm a new owner and have a question about oil viscosity choices. The owner's manual says I should replace it with 0W20 full synthetic oil. That viscosity is a more expensive grade than 5W20. Since I live in Phoenix and travel to CA and NV but never when it snows or gets extremely cold. Where I drive, the temperatures can range from 32 to 120 F. Can I save the money and go with 5W20 instead of the manufacturer's recommendations?