I took my f150 3.3 and had its second oil change factory spec is 5w20. My invoice papers today said they put 5W30 Motorcraft synthetic blend in it. I questioned it and the service guy said don’t pay attention to my owners manual. Said Ford changed spec for that engine to 5w30. I’ve looked on the web and find nothing on it. I don't think 5w30 is going to hurt my engine. Actually probably better. But just wanted facts. It’s free oil changes through the dealership I got it from. 2019 xlt 3.3 Got 5899 miles on it. I drive mostly short runs. I live two miles from work. I use my OLM and it’s basically running low at 3000 miles. Love my truck . While the weakest of all the engines , it’s plenty of power for my old ass. Gets 24 mpg on interstate. It has the 6 speed also.