Dealership put 5W-30 oil in my 2014 3.7 v6 mustang. Should I change it to 5w-20 or leave it? I’m in Florida if weather makes a difference. Service manual calls for 5W-20 synthetic, and I noticed the dealership (not ford) put 5w-30. It has only been about 600 miles with this oil, should I be concerned?

Also, If I change the oil to 5w-20, will I feel better response in acceleration and improved gas mileage? 